<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:ddce8c95-c80c-42c0-a4ed-78b370dce61b,g:aedd5436-e587-4c61-a5d0-acaf646eaeea-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:roleRef roleURI="http://www.formfactor.com/role/CONSOLIDATEDBALANCESHEETS" xlink:type="simple" xlink:href="form-20251227.xsd#CONSOLIDATEDBALANCESHEETS"/>
  <link:calculationLink xlink:role="http://www.formfactor.com/role/CONSOLIDATEDBALANCESHEETS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_78d49afa-6eb4-4c26-827d-510d1364419b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockValue_3c1ccc1f-0123-4922-9e35-fe98742c7f13" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_78d49afa-6eb4-4c26-827d-510d1364419b" xlink:to="loc_us-gaap_PreferredStockValue_3c1ccc1f-0123-4922-9e35-fe98742c7f13" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_2a401a1f-f2bd-4b3d-9703-0835d4877d3a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockValue"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_78d49afa-6eb4-4c26-827d-510d1364419b" xlink:to="loc_us-gaap_CommonStockValue_2a401a1f-f2bd-4b3d-9703-0835d4877d3a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalCommonStock_4199e739-61b1-45a1-a2e7-32a1f1e7c9fb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdditionalPaidInCapitalCommonStock"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_78d49afa-6eb4-4c26-827d-510d1364419b" xlink:to="loc_us-gaap_AdditionalPaidInCapitalCommonStock_4199e739-61b1-45a1-a2e7-32a1f1e7c9fb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_0b44051a-5efc-43d6-a610-866540e480c4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_78d49afa-6eb4-4c26-827d-510d1364419b" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_0b44051a-5efc-43d6-a610-866540e480c4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_cc617a32-9ab5-4c5c-a7c0-f594d0b72ff0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_78d49afa-6eb4-4c26-827d-510d1364419b" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_cc617a32-9ab5-4c5c-a7c0-f594d0b72ff0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_ca9c35b1-bf9f-4567-bab6-01f419753ca7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Assets"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_f066c704-2cda-42ff-8aaa-5c8fdf4c6d80" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_ca9c35b1-bf9f-4567-bab6-01f419753ca7" xlink:to="loc_us-gaap_AssetsCurrent_f066c704-2cda-42ff-8aaa-5c8fdf4c6d80" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsNoncurrent_59f01e15-782a-48d2-9637-e6fcc95efec6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedCashAndCashEquivalentsNoncurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_ca9c35b1-bf9f-4567-bab6-01f419753ca7" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsNoncurrent_59f01e15-782a-48d2-9637-e6fcc95efec6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_dad45bbd-ef14-4841-87ab-4449807f8aa5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_ca9c35b1-bf9f-4567-bab6-01f419753ca7" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_dad45bbd-ef14-4841-87ab-4449807f8aa5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_634f0c23-7909-4b08-9548-f99f9620f377" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_ca9c35b1-bf9f-4567-bab6-01f419753ca7" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_634f0c23-7909-4b08-9548-f99f9620f377" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestments_e7b48957-56c4-45a3-97fb-360eaf3c5218" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestments"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_ca9c35b1-bf9f-4567-bab6-01f419753ca7" xlink:to="loc_us-gaap_EquityMethodInvestments_e7b48957-56c4-45a3-97fb-360eaf3c5218" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_0b47a15e-62bd-4c70-9925-2c487953ccbc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Goodwill"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_ca9c35b1-bf9f-4567-bab6-01f419753ca7" xlink:to="loc_us-gaap_Goodwill_0b47a15e-62bd-4c70-9925-2c487953ccbc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_f9090e44-7048-4405-920f-8ccabec83166" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_ca9c35b1-bf9f-4567-bab6-01f419753ca7" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_f9090e44-7048-4405-920f-8ccabec83166" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxAssetsNet_618326b5-3861-4e5f-b3bf-9cc62c2bee02" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredIncomeTaxAssetsNet"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_ca9c35b1-bf9f-4567-bab6-01f419753ca7" xlink:to="loc_us-gaap_DeferredIncomeTaxAssetsNet_618326b5-3861-4e5f-b3bf-9cc62c2bee02" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_019c1eeb-3795-7175-a2fe-f59460d51721" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherAssetsNoncurrent"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_ca9c35b1-bf9f-4567-bab6-01f419753ca7" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_019c1eeb-3795-7175-a2fe-f59460d51721" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_7d80b4ea-f87c-43d7-8bfb-fcc0dd1d1e76" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_c204a60c-27f2-4db8-b17b-e1a11fbd157a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Liabilities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_7d80b4ea-f87c-43d7-8bfb-fcc0dd1d1e76" xlink:to="loc_us-gaap_Liabilities_c204a60c-27f2-4db8-b17b-e1a11fbd157a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_b0d76770-1ce4-4aaf-930a-a840f5f7973f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_7d80b4ea-f87c-43d7-8bfb-fcc0dd1d1e76" xlink:to="loc_us-gaap_StockholdersEquity_b0d76770-1ce4-4aaf-930a-a840f5f7973f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_32b614e1-9137-4691-9231-7913b11b1eba" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_1cae1dca-d125-4121-a4cc-1452da649dd6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_32b614e1-9137-4691-9231-7913b11b1eba" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_1cae1dca-d125-4121-a4cc-1452da649dd6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent_1ecf4b2a-b41a-4584-8b3b-ef117b481f82" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_32b614e1-9137-4691-9231-7913b11b1eba" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent_1ecf4b2a-b41a-4584-8b3b-ef117b481f82" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_3b898885-4fe3-49b8-b6f4-7a03ba82de4f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsReceivableNetCurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_32b614e1-9137-4691-9231-7913b11b1eba" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_3b898885-4fe3-49b8-b6f4-7a03ba82de4f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryNet_54e2e765-ddc9-4613-857d-b4592c1fd914" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InventoryNet"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_32b614e1-9137-4691-9231-7913b11b1eba" xlink:to="loc_us-gaap_InventoryNet_54e2e765-ddc9-4613-857d-b4592c1fd914" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue_d9f8f415-c7d5-4997-8972-6dea6c42d6ad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_32b614e1-9137-4691-9231-7913b11b1eba" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue_d9f8f415-c7d5-4997-8972-6dea6c42d6ad" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_f6d22505-faa9-4716-95c7-71ec36364875" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_32b614e1-9137-4691-9231-7913b11b1eba" xlink:to="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_f6d22505-faa9-4716-95c7-71ec36364875" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_1ce6396d-5ac9-464c-ba90-1deb217afcd2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCreditsAndOtherLiabilitiesCurrent_00d9c0f5-0e41-436c-b06e-9ebead47b47c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredCreditsAndOtherLiabilitiesCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_1ce6396d-5ac9-464c-ba90-1deb217afcd2" xlink:to="loc_us-gaap_DeferredCreditsAndOtherLiabilitiesCurrent_00d9c0f5-0e41-436c-b06e-9ebead47b47c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_5d1418da-f1b1-49c5-a55a-dfebda0ef6aa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseLiabilityCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_1ce6396d-5ac9-464c-ba90-1deb217afcd2" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrent_5d1418da-f1b1-49c5-a55a-dfebda0ef6aa" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrent_f8084f02-24d2-4b61-9af1-9ca742591beb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsPayableCurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_1ce6396d-5ac9-464c-ba90-1deb217afcd2" xlink:to="loc_us-gaap_AccountsPayableCurrent_f8084f02-24d2-4b61-9af1-9ca742591beb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_c4549c66-4f03-4248-8c99-80e7491f503e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccruedLiabilitiesCurrent"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_1ce6396d-5ac9-464c-ba90-1deb217afcd2" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrent_c4549c66-4f03-4248-8c99-80e7491f503e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtCurrent_81bebe39-dd80-4998-bb27-ea48c3725857" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtCurrent"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_1ce6396d-5ac9-464c-ba90-1deb217afcd2" xlink:to="loc_us-gaap_LongTermDebtCurrent_81bebe39-dd80-4998-bb27-ea48c3725857" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_7f9fb629-fceb-4d7b-83bd-0b3482c68567" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Liabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_a201da63-c2e3-41ad-8abc-d734791aea0d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_7f9fb629-fceb-4d7b-83bd-0b3482c68567" xlink:to="loc_us-gaap_LiabilitiesCurrent_a201da63-c2e3-41ad-8abc-d734791aea0d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_c3bb4e11-9f9e-49a2-a630-a093050a4385" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtNoncurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_7f9fb629-fceb-4d7b-83bd-0b3482c68567" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_c3bb4e11-9f9e-49a2-a630-a093050a4385" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_cd8175d6-d25f-4419-8b32-363596b7426e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredIncomeTaxLiabilitiesNet"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_7f9fb629-fceb-4d7b-83bd-0b3482c68567" xlink:to="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_cd8175d6-d25f-4419-8b32-363596b7426e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_dcab5442-c097-46a5-a549-9bcfd8305618" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_7f9fb629-fceb-4d7b-83bd-0b3482c68567" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_dcab5442-c097-46a5-a549-9bcfd8305618" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_DeferredGovernmentGrantLiability_3bcb4516-4c66-4943-bc87-a03e0ecbe8fb" xlink:href="form-20251227.xsd#form_DeferredGovernmentGrantLiability"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_7f9fb629-fceb-4d7b-83bd-0b3482c68567" xlink:to="loc_form_DeferredGovernmentGrantLiability_3bcb4516-4c66-4943-bc87-a03e0ecbe8fb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCreditsAndOtherLiabilitiesNoncurrent_019c1eeb-5638-7fa9-8948-b93ab31efe2f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredCreditsAndOtherLiabilitiesNoncurrent"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_7f9fb629-fceb-4d7b-83bd-0b3482c68567" xlink:to="loc_us-gaap_DeferredCreditsAndOtherLiabilitiesNoncurrent_019c1eeb-5638-7fa9-8948-b93ab31efe2f" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.formfactor.com/role/CONSOLIDATEDSTATEMENTSOFINCOME" xlink:type="simple" xlink:href="form-20251227.xsd#CONSOLIDATEDSTATEMENTSOFINCOME"/>
  <link:calculationLink xlink:role="http://www.formfactor.com/role/CONSOLIDATEDSTATEMENTSOFINCOME" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_c5b0e991-9499-423b-bb5a-2fca93565f6a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_4f37850a-675b-4df7-a20f-07628d5ae2f0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_c5b0e991-9499-423b-bb5a-2fca93565f6a" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_4f37850a-675b-4df7-a20f-07628d5ae2f0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_295919ee-0315-4f2e-8842-53da5fa1df61" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_c5b0e991-9499-423b-bb5a-2fca93565f6a" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_295919ee-0315-4f2e-8842-53da5fa1df61" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_IncomeLossFromEquityMethodInvestmentsAdjustmentToNetIncome_019c4493-f78f-7eab-8c9d-4ca243588ffd" xlink:href="form-20251227.xsd#form_IncomeLossFromEquityMethodInvestmentsAdjustmentToNetIncome"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_c5b0e991-9499-423b-bb5a-2fca93565f6a" xlink:to="loc_form_IncomeLossFromEquityMethodInvestmentsAdjustmentToNetIncome_019c4493-f78f-7eab-8c9d-4ca243588ffd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_366a154d-5b1a-474f-9ec4-ff1ab1b01940" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_ccf8612b-6c71-45f9-9095-a9c522675da9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_366a154d-5b1a-474f-9ec4-ff1ab1b01940" xlink:to="loc_us-gaap_OperatingIncomeLoss_ccf8612b-6c71-45f9-9095-a9c522675da9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIncomeInterest_aa32a44e-faad-411b-9bec-393dd357c19e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentIncomeInterest"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_366a154d-5b1a-474f-9ec4-ff1ab1b01940" xlink:to="loc_us-gaap_InvestmentIncomeInterest_aa32a44e-faad-411b-9bec-393dd357c19e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_286d72f4-dc2c-4fe0-b8f5-250ab6da9701" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_366a154d-5b1a-474f-9ec4-ff1ab1b01940" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_286d72f4-dc2c-4fe0-b8f5-250ab6da9701" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpense_7ad8fd3c-4864-425c-8286-22609ccc2cca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpense"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_366a154d-5b1a-474f-9ec4-ff1ab1b01940" xlink:to="loc_us-gaap_InterestExpense_7ad8fd3c-4864-425c-8286-22609ccc2cca" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpenses_17ec403c-1c9e-467f-a3b4-0785bb43e9cb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingExpenses"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpense_a1e9fa51-2e22-4919-9076-8f1ffbf46a0d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResearchAndDevelopmentExpense"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingExpenses_17ec403c-1c9e-467f-a3b4-0785bb43e9cb" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpense_a1e9fa51-2e22-4919-9076-8f1ffbf46a0d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_db113fcd-f397-4ebd-86ec-8b5ae55f0720" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SellingGeneralAndAdministrativeExpense"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingExpenses_17ec403c-1c9e-467f-a3b4-0785bb43e9cb" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_db113fcd-f397-4ebd-86ec-8b5ae55f0720" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_OperatingExpensesFactoryStartUpExpense_019c1ef3-13ae-76fd-9d6f-41f67bcc77d3" xlink:href="form-20251227.xsd#form_OperatingExpensesFactoryStartUpExpense"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingExpenses_17ec403c-1c9e-467f-a3b4-0785bb43e9cb" xlink:to="loc_form_OperatingExpensesFactoryStartUpExpense_019c1ef3-13ae-76fd-9d6f-41f67bcc77d3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_0217aa01-cb31-42b8-a700-b6c86d17be1d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpenses_5703d599-4a46-49e6-b7f2-cc771bd9535b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingExpenses"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_0217aa01-cb31-42b8-a700-b6c86d17be1d" xlink:to="loc_us-gaap_OperatingExpenses_5703d599-4a46-49e6-b7f2-cc771bd9535b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfBusiness_e282a942-a062-4ca5-97f0-1546bd713ed5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainLossOnSaleOfBusiness"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_0217aa01-cb31-42b8-a700-b6c86d17be1d" xlink:to="loc_us-gaap_GainLossOnSaleOfBusiness_e282a942-a062-4ca5-97f0-1546bd713ed5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_ca2f1bbc-957d-4008-a8b3-8110d93549b7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GrossProfit"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_0217aa01-cb31-42b8-a700-b6c86d17be1d" xlink:to="loc_us-gaap_GrossProfit_ca2f1bbc-957d-4008-a8b3-8110d93549b7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_b3c3ae31-698b-4b07-b277-b43c7205d8d6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GrossProfit"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_f02741e2-11b8-49d1-b201-5b7611c59eca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_GrossProfit_b3c3ae31-698b-4b07-b277-b43c7205d8d6" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_f02741e2-11b8-49d1-b201-5b7611c59eca" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_2027bccb-7c5d-4e12-a68b-342d472a0312" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_GrossProfit_b3c3ae31-698b-4b07-b277-b43c7205d8d6" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_2027bccb-7c5d-4e12-a68b-342d472a0312" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.formfactor.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME" xlink:type="simple" xlink:href="form-20251227.xsd#CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME"/>
  <link:calculationLink xlink:role="http://www.formfactor.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_79761cfe-8da1-43da-8a87-435bed113e65" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_60424413-efa4-479e-adb4-3c0ef70af2d3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_79761cfe-8da1-43da-8a87-435bed113e65" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_60424413-efa4-479e-adb4-3c0ef70af2d3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_1d0bb3dd-2824-4450-9092-1b105bfc608d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_79761cfe-8da1-43da-8a87-435bed113e65" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_1d0bb3dd-2824-4450-9092-1b105bfc608d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax_5e6d9278-5ea7-4175-b056-c77cddfe06ab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_79761cfe-8da1-43da-8a87-435bed113e65" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax_5e6d9278-5ea7-4175-b056-c77cddfe06ab" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_f5b93d42-a18d-4863-a774-2329baddf9d3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ComprehensiveIncomeNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_d6a3b4c4-5667-4661-80d0-07fc9acc24d4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_f5b93d42-a18d-4863-a774-2329baddf9d3" xlink:to="loc_us-gaap_NetIncomeLoss_d6a3b4c4-5667-4661-80d0-07fc9acc24d4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_4579b89c-7b76-4aad-87ed-8f4187932c58" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_f5b93d42-a18d-4863-a774-2329baddf9d3" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_4579b89c-7b76-4aad-87ed-8f4187932c58" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.formfactor.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS" xlink:type="simple" xlink:href="form-20251227.xsd#CONSOLIDATEDSTATEMENTSOFCASHFLOWS"/>
  <link:calculationLink xlink:role="http://www.formfactor.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_5c097dd4-3ffc-4f48-af3e-0dcd40778cf6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_6778e23b-ce2c-471c-b26a-9847c8c0820a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_5c097dd4-3ffc-4f48-af3e-0dcd40778cf6" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_6778e23b-ce2c-471c-b26a-9847c8c0820a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_b47890f6-4875-46c9-80c0-5f5fb1fb1dd1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_5c097dd4-3ffc-4f48-af3e-0dcd40778cf6" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_b47890f6-4875-46c9-80c0-5f5fb1fb1dd1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_804d6688-03f5-4d3d-979b-e9f073511924" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_5c097dd4-3ffc-4f48-af3e-0dcd40778cf6" xlink:to="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_804d6688-03f5-4d3d-979b-e9f073511924" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_f131e0f6-3531-449d-8476-9a48e9284a50" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_5c097dd4-3ffc-4f48-af3e-0dcd40778cf6" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_f131e0f6-3531-449d-8476-9a48e9284a50" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_d88e578d-80f2-4e9d-9e59-dbd0922511ef" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_f26e0f70-e683-47ce-a387-93c2413e216f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensation"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_d88e578d-80f2-4e9d-9e59-dbd0922511ef" xlink:to="loc_us-gaap_ShareBasedCompensation_f26e0f70-e683-47ce-a387-93c2413e216f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingLeaseLiability_baaa251d-9389-4342-9c07-3c538c75f53b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInOperatingLeaseLiability"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_d88e578d-80f2-4e9d-9e59-dbd0922511ef" xlink:to="loc_us-gaap_IncreaseDecreaseInOperatingLeaseLiability_baaa251d-9389-4342-9c07-3c538c75f53b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromEquityMethodInvestments_019c1ef6-a16e-7e9c-bc61-4370d7835720" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromEquityMethodInvestments"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_d88e578d-80f2-4e9d-9e59-dbd0922511ef" xlink:to="loc_us-gaap_IncomeLossFromEquityMethodInvestments_019c1ef6-a16e-7e9c-bc61-4370d7835720" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Depreciation_cff74b7c-06b4-436a-a8de-cf1afbdc7b3e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Depreciation"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_d88e578d-80f2-4e9d-9e59-dbd0922511ef" xlink:to="loc_us-gaap_Depreciation_cff74b7c-06b4-436a-a8de-cf1afbdc7b3e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_RestructuringChargesNonCash_7595fbf1-b6d3-4da5-889e-4e55fa7fd573" xlink:href="form-20251227.xsd#form_RestructuringChargesNonCash"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_d88e578d-80f2-4e9d-9e59-dbd0922511ef" xlink:to="loc_form_RestructuringChargesNonCash_7595fbf1-b6d3-4da5-889e-4e55fa7fd573" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_8b01be76-8340-4e6b-8a81-be8d972e19fe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInOtherOperatingAssets"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_d88e578d-80f2-4e9d-9e59-dbd0922511ef" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_8b01be76-8340-4e6b-8a81-be8d972e19fe" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_42a00239-3860-4ee0-9746-1122e4ac8121" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets"/>
    <link:calculationArc order="7" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_d88e578d-80f2-4e9d-9e59-dbd0922511ef" xlink:to="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_42a00239-3860-4ee0-9746-1122e4ac8121" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInDeferredLiabilities_dde87d82-4564-4980-8f1f-c4dbc36ef4fe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInDeferredLiabilities"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_d88e578d-80f2-4e9d-9e59-dbd0922511ef" xlink:to="loc_us-gaap_IncreaseDecreaseInDeferredLiabilities_dde87d82-4564-4980-8f1f-c4dbc36ef4fe" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInInventories_2caeb56b-2d9e-4093-8cc0-2096501c54fd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInInventories"/>
    <link:calculationArc order="9" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_d88e578d-80f2-4e9d-9e59-dbd0922511ef" xlink:to="loc_us-gaap_IncreaseDecreaseInInventories_2caeb56b-2d9e-4093-8cc0-2096501c54fd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_ReductionOfRightOfUseAssets_d9e5824f-1d80-4d69-907b-b8fa2f6dffaa" xlink:href="form-20251227.xsd#form_ReductionOfRightOfUseAssets"/>
    <link:calculationArc order="10" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_d88e578d-80f2-4e9d-9e59-dbd0922511ef" xlink:to="loc_form_ReductionOfRightOfUseAssets_d9e5824f-1d80-4d69-907b-b8fa2f6dffaa" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayable_e960a8d1-e0c9-4129-bc2e-536b7efb05f7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInAccountsPayable"/>
    <link:calculationArc order="11" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_d88e578d-80f2-4e9d-9e59-dbd0922511ef" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayable_e960a8d1-e0c9-4129-bc2e-536b7efb05f7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedLiabilities_482e9e88-ce83-4df8-a6fd-7851a3ceca42" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInAccruedLiabilities"/>
    <link:calculationArc order="12" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_d88e578d-80f2-4e9d-9e59-dbd0922511ef" xlink:to="loc_us-gaap_IncreaseDecreaseInAccruedLiabilities_482e9e88-ce83-4df8-a6fd-7851a3ceca42" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_cc6717a3-04e8-412f-aa62-c1f010f18fc4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit"/>
    <link:calculationArc order="13" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_d88e578d-80f2-4e9d-9e59-dbd0922511ef" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_cc6717a3-04e8-412f-aa62-c1f010f18fc4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_AcquiredInventoryStepupAmortization_bb3096f6-1ff4-4d29-90d3-6bbf44283366" xlink:href="form-20251227.xsd#form_AcquiredInventoryStepupAmortization"/>
    <link:calculationArc order="14" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_d88e578d-80f2-4e9d-9e59-dbd0922511ef" xlink:to="loc_form_AcquiredInventoryStepupAmortization_bb3096f6-1ff4-4d29-90d3-6bbf44283366" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_CreditLossOnDebtReceivable_927c5489-77a8-48ee-a2bc-6b438cb2dfba" xlink:href="form-20251227.xsd#form_CreditLossOnDebtReceivable"/>
    <link:calculationArc order="15" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_d88e578d-80f2-4e9d-9e59-dbd0922511ef" xlink:to="loc_form_CreditLossOnDebtReceivable_927c5489-77a8-48ee-a2bc-6b438cb2dfba" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_c533efe0-9d23-4f09-bf04-e4878973478f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable"/>
    <link:calculationArc order="16" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_d88e578d-80f2-4e9d-9e59-dbd0922511ef" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_c533efe0-9d23-4f09-bf04-e4878973478f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnDispositionOfAssets1_1f4a64b0-a433-47fc-b61d-92f7f7e78d1c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainLossOnDispositionOfAssets1"/>
    <link:calculationArc order="17" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_d88e578d-80f2-4e9d-9e59-dbd0922511ef" xlink:to="loc_us-gaap_GainLossOnDispositionOfAssets1_1f4a64b0-a433-47fc-b61d-92f7f7e78d1c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryWriteDown_c2e24e89-c07a-44d8-be47-60565ca96d3a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InventoryWriteDown"/>
    <link:calculationArc order="18" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_d88e578d-80f2-4e9d-9e59-dbd0922511ef" xlink:to="loc_us-gaap_InventoryWriteDown_c2e24e89-c07a-44d8-be47-60565ca96d3a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_IncreaseDecreaseInDeferredGovernmentGrant_988caff7-5a29-4327-af36-02d922440571" xlink:href="form-20251227.xsd#form_IncreaseDecreaseInDeferredGovernmentGrant"/>
    <link:calculationArc order="19" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_d88e578d-80f2-4e9d-9e59-dbd0922511ef" xlink:to="loc_form_IncreaseDecreaseInDeferredGovernmentGrant_988caff7-5a29-4327-af36-02d922440571" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCurrencyTransactionGainLossUnrealized_e937bc35-d268-4a73-9dc9-188149d76cfe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ForeignCurrencyTransactionGainLossUnrealized"/>
    <link:calculationArc order="20" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_d88e578d-80f2-4e9d-9e59-dbd0922511ef" xlink:to="loc_us-gaap_ForeignCurrencyTransactionGainLossUnrealized_e937bc35-d268-4a73-9dc9-188149d76cfe" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_e25d7c65-d147-4078-b183-adfc952b064c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInOtherOperatingLiabilities"/>
    <link:calculationArc order="21" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_d88e578d-80f2-4e9d-9e59-dbd0922511ef" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_e25d7c65-d147-4078-b183-adfc952b064c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments_a2cac1f9-c719-4145-beff-27f14566e595" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments"/>
    <link:calculationArc order="22" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_d88e578d-80f2-4e9d-9e59-dbd0922511ef" xlink:to="loc_us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments_a2cac1f9-c719-4145-beff-27f14566e595" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_d0287353-d34e-4a55-a3af-8fabc3f1f29f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:calculationArc order="23" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_d88e578d-80f2-4e9d-9e59-dbd0922511ef" xlink:to="loc_us-gaap_NetIncomeLoss_d0287353-d34e-4a55-a3af-8fabc3f1f29f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_86352b95-ac7c-4b02-ad0b-bc8460c14f9c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_da13a90c-f0c9-4bde-8745-00df98cdd09e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_86352b95-ac7c-4b02-ad0b-bc8460c14f9c" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_da13a90c-f0c9-4bde-8745-00df98cdd09e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_d1f1026b-7919-41b6-afd0-e989433f5737" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_86352b95-ac7c-4b02-ad0b-bc8460c14f9c" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_d1f1026b-7919-41b6-afd0-e989433f5737" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested_6e99a240-46f1-4a69-aa86-d79824dad4ac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_86352b95-ac7c-4b02-ad0b-bc8460c14f9c" xlink:to="loc_us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested_6e99a240-46f1-4a69-aa86-d79824dad4ac" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireEquityMethodInvestments_7c5acc37-8876-4858-85ba-80515f5bd8bb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquireEquityMethodInvestments"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_86352b95-ac7c-4b02-ad0b-bc8460c14f9c" xlink:to="loc_us-gaap_PaymentsToAcquireEquityMethodInvestments_7c5acc37-8876-4858-85ba-80515f5bd8bb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireNotesReceivable_d21c4fa1-e4ef-4435-a356-60bb051a9628" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquireNotesReceivable"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_86352b95-ac7c-4b02-ad0b-bc8460c14f9c" xlink:to="loc_us-gaap_PaymentsToAcquireNotesReceivable_d21c4fa1-e4ef-4435-a356-60bb051a9628" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt_21340be0-38d5-4f93-8bd3-5846add1a469" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_86352b95-ac7c-4b02-ad0b-bc8460c14f9c" xlink:to="loc_us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt_21340be0-38d5-4f93-8bd3-5846add1a469" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities_019c1ef6-e8ad-7b7a-b4ec-547add1aa697" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_86352b95-ac7c-4b02-ad0b-bc8460c14f9c" xlink:to="loc_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities_019c1ef6-e8ad-7b7a-b4ec-547add1aa697" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_3d5434b8-6bea-443a-939b-9bbc6957d6e8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashNoncurrent_4347edb5-6311-4cf0-a918-df718c33eceb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedCashNoncurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_3d5434b8-6bea-443a-939b-9bbc6957d6e8" xlink:to="loc_us-gaap_RestrictedCashNoncurrent_4347edb5-6311-4cf0-a918-df718c33eceb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_54ebee48-2c76-4938-96c6-8e1197282d4a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_3d5434b8-6bea-443a-939b-9bbc6957d6e8" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_54ebee48-2c76-4938-96c6-8e1197282d4a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashCurrent_efa4143e-6ab2-4526-a48c-28f3dc753834" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedCashCurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_3d5434b8-6bea-443a-939b-9bbc6957d6e8" xlink:to="loc_us-gaap_RestrictedCashCurrent_efa4143e-6ab2-4526-a48c-28f3dc753834" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_18ed582e-9d3c-40f3-8e10-9f4ab19974b5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions_0542420d-d566-49ca-94e0-eef5eefb3e73" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_18ed582e-9d3c-40f3-8e10-9f4ab19974b5" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions_0542420d-d566-49ca-94e0-eef5eefb3e73" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_66f5b6e5-b42b-4d56-b75b-a2068bfa8709" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_18ed582e-9d3c-40f3-8e10-9f4ab19974b5" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_66f5b6e5-b42b-4d56-b75b-a2068bfa8709" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfLongTermDebt_bf42ebe0-0ecd-4b59-940f-f136cb8eb2cb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RepaymentsOfLongTermDebt"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_18ed582e-9d3c-40f3-8e10-9f4ab19974b5" xlink:to="loc_us-gaap_RepaymentsOfLongTermDebt_bf42ebe0-0ecd-4b59-940f-f136cb8eb2cb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_7bd2745a-5c7b-46d2-9797-a819ce54a6ee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_18ed582e-9d3c-40f3-8e10-9f4ab19974b5" xlink:to="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_7bd2745a-5c7b-46d2-9797-a819ce54a6ee" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.formfactor.com/role/SummaryofSignificantAccountingPoliciesNetIncomeperShareDetails" xlink:type="simple" xlink:href="form-20251227.xsd#SummaryofSignificantAccountingPoliciesNetIncomeperShareDetails"/>
  <link:calculationLink xlink:role="http://www.formfactor.com/role/SummaryofSignificantAccountingPoliciesNetIncomeperShareDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_7a0a72b4-398c-44a6-92ed-d2ec404565a5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_81a2e267-25ea-458e-9b5b-51211fc979fb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_7a0a72b4-398c-44a6-92ed-d2ec404565a5" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_81a2e267-25ea-458e-9b5b-51211fc979fb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_5736b14a-d0c2-4dbf-b172-722552ff267a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_7a0a72b4-398c-44a6-92ed-d2ec404565a5" xlink:to="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_5736b14a-d0c2-4dbf-b172-722552ff267a" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.formfactor.com/role/SummaryofSignificantAccountingPoliciesAccumulatedOtherComprehensiveIncomeLossDetails" xlink:type="simple" xlink:href="form-20251227.xsd#SummaryofSignificantAccountingPoliciesAccumulatedOtherComprehensiveIncomeLossDetails"/>
  <link:calculationLink xlink:role="http://www.formfactor.com/role/SummaryofSignificantAccountingPoliciesAccumulatedOtherComprehensiveIncomeLossDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_ed6f60ac-6a77-4950-8a06-cdf288b4788b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_7fd783c0-f1c9-443f-86ba-a75bda8c67a9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_ed6f60ac-6a77-4950-8a06-cdf288b4788b" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_7fd783c0-f1c9-443f-86ba-a75bda8c67a9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax_79330518-3d81-473d-9c1b-444d6fc34c70" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_ed6f60ac-6a77-4950-8a06-cdf288b4788b" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax_79330518-3d81-473d-9c1b-444d6fc34c70" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AociLossCashFlowHedgeCumulativeGainLossAfterTax_36c12ebd-0b8b-4dc6-86fc-43143fd07729" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AociLossCashFlowHedgeCumulativeGainLossAfterTax"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_ed6f60ac-6a77-4950-8a06-cdf288b4788b" xlink:to="loc_us-gaap_AociLossCashFlowHedgeCumulativeGainLossAfterTax_36c12ebd-0b8b-4dc6-86fc-43143fd07729" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.formfactor.com/role/BalanceSheetComponentsMarketableSecuritiesDetails" xlink:type="simple" xlink:href="form-20251227.xsd#BalanceSheetComponentsMarketableSecuritiesDetails"/>
  <link:calculationLink xlink:role="http://www.formfactor.com/role/BalanceSheetComponentsMarketableSecuritiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_ec682d21-4dd8-47b7-9715-f6265f236325" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_8abb4ffc-a4fd-491c-9e82-01e44f61106b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_ec682d21-4dd8-47b7-9715-f6265f236325" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_8abb4ffc-a4fd-491c-9e82-01e44f61106b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_b7ca5e9c-fc74-4e5a-86bc-0eeb1b6a8dbc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_ec682d21-4dd8-47b7-9715-f6265f236325" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_b7ca5e9c-fc74-4e5a-86bc-0eeb1b6a8dbc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_206d66fb-4650-4f07-8d36-acd4d764e95f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_ec682d21-4dd8-47b7-9715-f6265f236325" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_206d66fb-4650-4f07-8d36-acd4d764e95f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_3ae34f70-6451-48aa-bd7f-789ee98e5232" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue_1ab58477-3f2f-4d3a-a811-2c385184b040" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_3ae34f70-6451-48aa-bd7f-789ee98e5232" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue_1ab58477-3f2f-4d3a-a811-2c385184b040" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_5f25d96e-bf00-4e60-be71-9cc3913f3a83" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_3ae34f70-6451-48aa-bd7f-789ee98e5232" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_5f25d96e-bf00-4e60-be71-9cc3913f3a83" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.formfactor.com/role/BalanceSheetComponentsMarketableSecuritiesDetails_1" xlink:type="simple" xlink:href="form-20251227.xsd#BalanceSheetComponentsMarketableSecuritiesDetails_1"/>
  <link:calculationLink xlink:role="http://www.formfactor.com/role/BalanceSheetComponentsMarketableSecuritiesDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_44564dfc-d4f9-48c5-9f20-d46f586124b2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost_627738e2-5cd5-4c6a-9a49-9fbc6f078fd0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_44564dfc-d4f9-48c5-9f20-d46f586124b2" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost_627738e2-5cd5-4c6a-9a49-9fbc6f078fd0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost_3f1c4645-11f5-4786-917b-501ee3cea649" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_44564dfc-d4f9-48c5-9f20-d46f586124b2" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost_3f1c4645-11f5-4786-917b-501ee3cea649" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.formfactor.com/role/BalanceSheetComponentsInventoryDetails" xlink:type="simple" xlink:href="form-20251227.xsd#BalanceSheetComponentsInventoryDetails"/>
  <link:calculationLink xlink:role="http://www.formfactor.com/role/BalanceSheetComponentsInventoryDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryNet_5ac64146-eaab-41a9-953f-ef0c65050166" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InventoryNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryRawMaterialsNetOfReserves_9ec4baf5-bb0f-480d-b2da-6e4465d410f7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InventoryRawMaterialsNetOfReserves"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InventoryNet_5ac64146-eaab-41a9-953f-ef0c65050166" xlink:to="loc_us-gaap_InventoryRawMaterialsNetOfReserves_9ec4baf5-bb0f-480d-b2da-6e4465d410f7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryWorkInProcessNetOfReserves_7d5924ee-cffc-49d0-bef0-b16406c5e3d3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InventoryWorkInProcessNetOfReserves"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InventoryNet_5ac64146-eaab-41a9-953f-ef0c65050166" xlink:to="loc_us-gaap_InventoryWorkInProcessNetOfReserves_7d5924ee-cffc-49d0-bef0-b16406c5e3d3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryFinishedGoodsNetOfReserves_7e3e0047-bfa2-4709-b432-6c9f333a5a8d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InventoryFinishedGoodsNetOfReserves"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InventoryNet_5ac64146-eaab-41a9-953f-ef0c65050166" xlink:to="loc_us-gaap_InventoryFinishedGoodsNetOfReserves_7e3e0047-bfa2-4709-b432-6c9f333a5a8d" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.formfactor.com/role/BalanceSheetComponentsPropertyPlantandEquipmentDetails" xlink:type="simple" xlink:href="form-20251227.xsd#BalanceSheetComponentsPropertyPlantandEquipmentDetails"/>
  <link:calculationLink xlink:role="http://www.formfactor.com/role/BalanceSheetComponentsPropertyPlantandEquipmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_5305f125-1e36-431f-8e63-6d56cbc9d7aa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_e5ce4b38-e3f4-4dc4-875d-5fdfdb96fa1f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentGross"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNet_5305f125-1e36-431f-8e63-6d56cbc9d7aa" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_e5ce4b38-e3f4-4dc4-875d-5fdfdb96fa1f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_0f7291d1-84a5-4224-ab75-805a7d55b65f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNet_5305f125-1e36-431f-8e63-6d56cbc9d7aa" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_0f7291d1-84a5-4224-ab75-805a7d55b65f" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.formfactor.com/role/BalanceSheetComponentsAccruedLiabilitiesDetails" xlink:type="simple" xlink:href="form-20251227.xsd#BalanceSheetComponentsAccruedLiabilitiesDetails"/>
  <link:calculationLink xlink:role="http://www.formfactor.com/role/BalanceSheetComponentsAccruedLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_d22882ba-c4b0-4387-801f-b2eccd1e2ba2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccruedLiabilitiesCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_AccruedEmployeeStockPurchasePlanContributionsWithheld_95811d22-4ce7-4e2c-a440-ce8d5f87b358" xlink:href="form-20251227.xsd#form_AccruedEmployeeStockPurchasePlanContributionsWithheld"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_d22882ba-c4b0-4387-801f-b2eccd1e2ba2" xlink:to="loc_form_AccruedEmployeeStockPurchasePlanContributionsWithheld_95811d22-4ce7-4e2c-a440-ce8d5f87b358" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_AccruedIncomeAndOtherTaxes_4789b8cd-8833-482a-ade5-947d8441ec85" xlink:href="form-20251227.xsd#form_AccruedIncomeAndOtherTaxes"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_d22882ba-c4b0-4387-801f-b2eccd1e2ba2" xlink:to="loc_form_AccruedIncomeAndOtherTaxes_4789b8cd-8833-482a-ade5-947d8441ec85" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductWarrantyAccrualClassifiedCurrent_486c0e0b-7525-4580-b9f0-c289e0e2818c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProductWarrantyAccrualClassifiedCurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_d22882ba-c4b0-4387-801f-b2eccd1e2ba2" xlink:to="loc_us-gaap_ProductWarrantyAccrualClassifiedCurrent_486c0e0b-7525-4580-b9f0-c289e0e2818c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAccruedLiabilitiesCurrent_861cb471-5351-4fff-89cf-d9b65ba9f0c4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherAccruedLiabilitiesCurrent"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_d22882ba-c4b0-4387-801f-b2eccd1e2ba2" xlink:to="loc_us-gaap_OtherAccruedLiabilitiesCurrent_861cb471-5351-4fff-89cf-d9b65ba9f0c4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_1755c994-9795-4d8d-b0f0-c7522e58a0a8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeRelatedLiabilitiesCurrent"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_d22882ba-c4b0-4387-801f-b2eccd1e2ba2" xlink:to="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_1755c994-9795-4d8d-b0f0-c7522e58a0a8" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.formfactor.com/role/AcquisitionAssetsAcquiredandLiabilitiesAssumedDetails" xlink:type="simple" xlink:href="form-20251227.xsd#AcquisitionAssetsAcquiredandLiabilitiesAssumedDetails"/>
  <link:calculationLink xlink:role="http://www.formfactor.com/role/AcquisitionAssetsAcquiredandLiabilitiesAssumedDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_form_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleAssets_473d0ec2-c823-4ad6-9c71-0a50c51c493b" xlink:href="form-20251227.xsd#form_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleAssets"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_b7598d4d-2ba5-456d-814a-b74c81330c28" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleAssets_473d0ec2-c823-4ad6-9c71-0a50c51c493b" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_b7598d4d-2ba5-456d-814a-b74c81330c28" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_93715ceb-e130-4824-bfb6-2d15c7c6a92b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleAssets_473d0ec2-c823-4ad6-9c71-0a50c51c493b" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_93715ceb-e130-4824-bfb6-2d15c7c6a92b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_019c1efa-bf7d-70e7-b2fe-8d73e4bad0f9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleAssets_473d0ec2-c823-4ad6-9c71-0a50c51c493b" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_019c1efa-bf7d-70e7-b2fe-8d73e4bad0f9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_BusinessCombinationRecognizedAssetAcquiredOperatingLeaseRightOfUseAsset_eb384b88-1c85-4ee9-8489-dec23c903513" xlink:href="form-20251227.xsd#form_BusinessCombinationRecognizedAssetAcquiredOperatingLeaseRightOfUseAsset"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleAssets_473d0ec2-c823-4ad6-9c71-0a50c51c493b" xlink:to="loc_form_BusinessCombinationRecognizedAssetAcquiredOperatingLeaseRightOfUseAsset_eb384b88-1c85-4ee9-8489-dec23c903513" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherAsset_5697a3cb-e7d2-4d45-92f1-6f3b404f4012" xlink:href="form-20251227.xsd#form_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherAsset"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleAssets_473d0ec2-c823-4ad6-9c71-0a50c51c493b" xlink:to="loc_form_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherAsset_5697a3cb-e7d2-4d45-92f1-6f3b404f4012" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_5e305f03-011f-4c98-97f8-6cffcaf467e2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_a2aa5cf4-5b16-4183-9154-ecf839c1faf2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Goodwill"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_5e305f03-011f-4c98-97f8-6cffcaf467e2" xlink:to="loc_us-gaap_Goodwill_a2aa5cf4-5b16-4183-9154-ecf839c1faf2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_a1453d06-09ad-44ae-a9fa-eb386456cc49" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_5e305f03-011f-4c98-97f8-6cffcaf467e2" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_a1453d06-09ad-44ae-a9fa-eb386456cc49" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleAssetsAndLiabilitiesNet_f7c59712-f806-4121-af82-b40bd62d6f72" xlink:href="form-20251227.xsd#form_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleAssetsAndLiabilitiesNet"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_5e305f03-011f-4c98-97f8-6cffcaf467e2" xlink:to="loc_form_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleAssetsAndLiabilitiesNet_f7c59712-f806-4121-af82-b40bd62d6f72" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleAssetsAndLiabilitiesNet_b9ddc03f-9cc7-47c1-8dd7-18da7310a955" xlink:href="form-20251227.xsd#form_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleAssetsAndLiabilitiesNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleAssets_66e9beab-c9a4-4768-9426-f8d3d136da4d" xlink:href="form-20251227.xsd#form_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleAssets"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleAssetsAndLiabilitiesNet_b9ddc03f-9cc7-47c1-8dd7-18da7310a955" xlink:to="loc_form_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleAssets_66e9beab-c9a4-4768-9426-f8d3d136da4d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable_019c1ef9-744b-7312-b6d9-965eb0b744e8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleAssetsAndLiabilitiesNet_b9ddc03f-9cc7-47c1-8dd7-18da7310a955" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable_019c1ef9-744b-7312-b6d9-965eb0b744e8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCapitalLeaseObligation_019c1ef9-9d35-761c-b87e-25ce1551cb2f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCapitalLeaseObligation"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleAssetsAndLiabilitiesNet_b9ddc03f-9cc7-47c1-8dd7-18da7310a955" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCapitalLeaseObligation_019c1ef9-9d35-761c-b87e-25ce1551cb2f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities_62e1811e-eb3f-4a4c-9563-1af520606b1c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleAssetsAndLiabilitiesNet_b9ddc03f-9cc7-47c1-8dd7-18da7310a955" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities_62e1811e-eb3f-4a4c-9563-1af520606b1c" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.formfactor.com/role/DivestureFairValueDisclosureDetails" xlink:type="simple" xlink:href="form-20251227.xsd#DivestureFairValueDisclosureDetails"/>
  <link:calculationLink xlink:role="http://www.formfactor.com/role/DivestureFairValueDisclosureDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_form_DisposalGroupIncludingDiscontinuedOperationConsiderationNet_8e553c8c-84f1-49dd-a16d-986b4692684f" xlink:href="form-20251227.xsd#form_DisposalGroupIncludingDiscontinuedOperationConsiderationNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_DisposalGroupIncludingDiscontinuedOperationCashTransferred_177bdff1-5732-431e-9815-023a13b587f6" xlink:href="form-20251227.xsd#form_DisposalGroupIncludingDiscontinuedOperationCashTransferred"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_DisposalGroupIncludingDiscontinuedOperationConsiderationNet_8e553c8c-84f1-49dd-a16d-986b4692684f" xlink:to="loc_form_DisposalGroupIncludingDiscontinuedOperationCashTransferred_177bdff1-5732-431e-9815-023a13b587f6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_DisposalGroupIncludingDiscontinuedOperationEstimatedWorkingCapitalAdjustment_0f18e58e-2a85-4e5d-8759-df8719f38f85" xlink:href="form-20251227.xsd#form_DisposalGroupIncludingDiscontinuedOperationEstimatedWorkingCapitalAdjustment"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_DisposalGroupIncludingDiscontinuedOperationConsiderationNet_8e553c8c-84f1-49dd-a16d-986b4692684f" xlink:to="loc_form_DisposalGroupIncludingDiscontinuedOperationEstimatedWorkingCapitalAdjustment_0f18e58e-2a85-4e5d-8759-df8719f38f85" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_DisposalGroupIncludingDiscontinuedOperationDirectCostsToSell_5904a339-9654-4cc4-a45b-5a7d5800110c" xlink:href="form-20251227.xsd#form_DisposalGroupIncludingDiscontinuedOperationDirectCostsToSell"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_DisposalGroupIncludingDiscontinuedOperationConsiderationNet_8e553c8c-84f1-49dd-a16d-986b4692684f" xlink:to="loc_form_DisposalGroupIncludingDiscontinuedOperationDirectCostsToSell_5904a339-9654-4cc4-a45b-5a7d5800110c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration_62290545-f6c5-49ae-8848-62e0339e245f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_DisposalGroupIncludingDiscontinuedOperationConsiderationNet_8e553c8c-84f1-49dd-a16d-986b4692684f" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration_62290545-f6c5-49ae-8848-62e0339e245f" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.formfactor.com/role/DivestureScheduleofAssetsandLiabilitiesHeldforSaleDetails" xlink:type="simple" xlink:href="form-20251227.xsd#DivestureScheduleofAssetsandLiabilitiesHeldforSaleDetails"/>
  <link:calculationLink xlink:role="http://www.formfactor.com/role/DivestureScheduleofAssetsandLiabilitiesHeldforSaleDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation_281911e0-c9c0-409f-ad7d-2bc9cda1f5fd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherLiabilities_e31328d9-ea6e-4b8e-98e9-3c909ff141bf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherLiabilities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation_281911e0-c9c0-409f-ad7d-2bc9cda1f5fd" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherLiabilities_e31328d9-ea6e-4b8e-98e9-3c909ff141bf" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentLiabilities_44c1cae1-d804-4769-a91f-1650b702131c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentLiabilities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation_281911e0-c9c0-409f-ad7d-2bc9cda1f5fd" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentLiabilities_44c1cae1-d804-4769-a91f-1650b702131c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationDeferredRevenue_6d82b6f3-60bc-40c7-bb7f-4eb44f2373c0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationDeferredRevenue"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation_281911e0-c9c0-409f-ad7d-2bc9cda1f5fd" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationDeferredRevenue_6d82b6f3-60bc-40c7-bb7f-4eb44f2373c0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation_770cc583-82c5-42fb-b8bf-8e4e7449cc01" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherAssets_cf07cf20-6b25-4f49-bb65-c6804c1bf4a7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherAssets"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation_770cc583-82c5-42fb-b8bf-8e4e7449cc01" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherAssets_cf07cf20-6b25-4f49-bb65-c6804c1bf4a7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent_5165e00c-9b51-47bb-8f8d-418de1a116b7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation_770cc583-82c5-42fb-b8bf-8e4e7449cc01" xlink:to="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent_5165e00c-9b51-47bb-8f8d-418de1a116b7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationIntangibleAssetsCurrent_51400005-f42f-43b4-b48f-26c6c9b6aa8a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationIntangibleAssetsCurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation_770cc583-82c5-42fb-b8bf-8e4e7449cc01" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationIntangibleAssetsCurrent_51400005-f42f-43b4-b48f-26c6c9b6aa8a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationGoodwillCurrent_64d6be3c-3e98-49a1-be79-58fb3c5a7481" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationGoodwillCurrent"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation_770cc583-82c5-42fb-b8bf-8e4e7449cc01" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationGoodwillCurrent_64d6be3c-3e98-49a1-be79-58fb3c5a7481" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent_6e067d41-adf0-4ad3-a9f8-3bbbe6c87ab0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationInventory1_a518c51a-c5d9-406d-8e0c-f8f9f3eb992d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationInventory1"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent_6e067d41-adf0-4ad3-a9f8-3bbbe6c87ab0" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationInventory1_a518c51a-c5d9-406d-8e0c-f8f9f3eb992d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets_ba456fce-afbf-4ebe-a5a0-8762982314f5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent_6e067d41-adf0-4ad3-a9f8-3bbbe6c87ab0" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets_ba456fce-afbf-4ebe-a5a0-8762982314f5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet_92fbd74e-c31d-4a35-8c21-682b11d415ce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent_6e067d41-adf0-4ad3-a9f8-3bbbe6c87ab0" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet_92fbd74e-c31d-4a35-8c21-682b11d415ce" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.formfactor.com/role/DebtScheduleofDebtDetails" xlink:type="simple" xlink:href="form-20251227.xsd#DebtScheduleofDebtDetails"/>
  <link:calculationLink xlink:role="http://www.formfactor.com/role/DebtScheduleofDebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_35114a0d-9f91-44ff-be4e-270efec0297e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebt"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_41c76422-18c2-46ee-9fc3-8914205928e4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebt_35114a0d-9f91-44ff-be4e-270efec0297e" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_41c76422-18c2-46ee-9fc3-8914205928e4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsNet_1f51c274-cb38-477a-8d2e-0ee97286ee51" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredFinanceCostsNet"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebt_35114a0d-9f91-44ff-be4e-270efec0297e" xlink:to="loc_us-gaap_DeferredFinanceCostsNet_1f51c274-cb38-477a-8d2e-0ee97286ee51" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.formfactor.com/role/DebtFuturePrincipleandInterestPaymentsDetails" xlink:type="simple" xlink:href="form-20251227.xsd#DebtFuturePrincipleandInterestPaymentsDetails"/>
  <link:calculationLink xlink:role="http://www.formfactor.com/role/DebtFuturePrincipleandInterestPaymentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_form_LongTermDebtMaturitiesTotalPaymentDueYearTwo_fe31c395-2b62-420a-a5b4-779de5edfafb" xlink:href="form-20251227.xsd#form_LongTermDebtMaturitiesTotalPaymentDueYearTwo"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_6db94aa9-c0d9-4297-a297-e3a6f02a6eaf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_LongTermDebtMaturitiesTotalPaymentDueYearTwo_fe31c395-2b62-420a-a5b4-779de5edfafb" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_6db94aa9-c0d9-4297-a297-e3a6f02a6eaf" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_LongtermDebtMaturitiesPaymentsOfInterestInYearTwo_ef217498-fe9c-4f15-be87-e64d7a97adcf" xlink:href="form-20251227.xsd#form_LongtermDebtMaturitiesPaymentsOfInterestInYearTwo"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_LongTermDebtMaturitiesTotalPaymentDueYearTwo_fe31c395-2b62-420a-a5b4-779de5edfafb" xlink:to="loc_form_LongtermDebtMaturitiesPaymentsOfInterestInYearTwo_ef217498-fe9c-4f15-be87-e64d7a97adcf" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_LongTermDebtMaturitiesCommitmentFeeInYearTwo_019c1fb3-bffd-7bc0-8672-848eddb9a6a1" xlink:href="form-20251227.xsd#form_LongTermDebtMaturitiesCommitmentFeeInYearTwo"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_LongTermDebtMaturitiesTotalPaymentDueYearTwo_fe31c395-2b62-420a-a5b4-779de5edfafb" xlink:to="loc_form_LongTermDebtMaturitiesCommitmentFeeInYearTwo_019c1fb3-bffd-7bc0-8672-848eddb9a6a1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_7fa599e3-8f7b-4332-ac4d-3ced53f27434" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_fc717781-13ce-438e-b532-cced2a7456c4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DebtInstrumentCarryingAmount_7fa599e3-8f7b-4332-ac4d-3ced53f27434" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_fc717781-13ce-438e-b532-cced2a7456c4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive_5d7c19b6-91ef-426e-9bde-85c09b50a09b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DebtInstrumentCarryingAmount_7fa599e3-8f7b-4332-ac4d-3ced53f27434" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive_5d7c19b6-91ef-426e-9bde-85c09b50a09b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_53a05f63-c963-497e-a079-2cf0a1f74749" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DebtInstrumentCarryingAmount_7fa599e3-8f7b-4332-ac4d-3ced53f27434" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_53a05f63-c963-497e-a079-2cf0a1f74749" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive_eba1b424-9700-4f0d-aa3c-93c965165878" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DebtInstrumentCarryingAmount_7fa599e3-8f7b-4332-ac4d-3ced53f27434" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive_eba1b424-9700-4f0d-aa3c-93c965165878" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_690a180c-648e-4d9a-be54-0fb11a2cede5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DebtInstrumentCarryingAmount_7fa599e3-8f7b-4332-ac4d-3ced53f27434" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_690a180c-648e-4d9a-be54-0fb11a2cede5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_62e3a8f3-3da9-4505-8b36-7e3ce29cb33c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DebtInstrumentCarryingAmount_7fa599e3-8f7b-4332-ac4d-3ced53f27434" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_62e3a8f3-3da9-4505-8b36-7e3ce29cb33c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_LongTermDebtMaturitiesTotalPaymentDueYearFour_dd180e29-cd1e-4676-9933-fda611296c53" xlink:href="form-20251227.xsd#form_LongTermDebtMaturitiesTotalPaymentDueYearFour"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_f394826f-09ac-4fb0-80f7-378710262ee0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_LongTermDebtMaturitiesTotalPaymentDueYearFour_dd180e29-cd1e-4676-9933-fda611296c53" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_f394826f-09ac-4fb0-80f7-378710262ee0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_LongTermDebtMaturitiesPaymentsOfInterestDueYearFour_d8b8ae27-1fdf-43f5-bbca-6414fb2a3c3b" xlink:href="form-20251227.xsd#form_LongTermDebtMaturitiesPaymentsOfInterestDueYearFour"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_LongTermDebtMaturitiesTotalPaymentDueYearFour_dd180e29-cd1e-4676-9933-fda611296c53" xlink:to="loc_form_LongTermDebtMaturitiesPaymentsOfInterestDueYearFour_d8b8ae27-1fdf-43f5-bbca-6414fb2a3c3b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_LongTermDebtMaturitiesCommitmentFeeInYearFour_019c1fb3-ed5b-79fc-80fa-7a92b62da6b4" xlink:href="form-20251227.xsd#form_LongTermDebtMaturitiesCommitmentFeeInYearFour"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_LongTermDebtMaturitiesTotalPaymentDueYearFour_dd180e29-cd1e-4676-9933-fda611296c53" xlink:to="loc_form_LongTermDebtMaturitiesCommitmentFeeInYearFour_019c1fb3-ed5b-79fc-80fa-7a92b62da6b4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_LongTermDebtMaturitiesTotalPaymentDueYearFive_17113545-5bc2-4ef5-aace-43cafcc5d521" xlink:href="form-20251227.xsd#form_LongTermDebtMaturitiesTotalPaymentDueYearFive"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive_da9f1758-151c-4002-ac2c-385c05569fe1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_LongTermDebtMaturitiesTotalPaymentDueYearFive_17113545-5bc2-4ef5-aace-43cafcc5d521" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive_da9f1758-151c-4002-ac2c-385c05569fe1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_LongTermDebtMaturitiesPaymentsOfInterestDueYearFive_5448e21b-b9f4-4dd9-a0e2-faa669fc3117" xlink:href="form-20251227.xsd#form_LongTermDebtMaturitiesPaymentsOfInterestDueYearFive"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_LongTermDebtMaturitiesTotalPaymentDueYearFive_17113545-5bc2-4ef5-aace-43cafcc5d521" xlink:to="loc_form_LongTermDebtMaturitiesPaymentsOfInterestDueYearFive_5448e21b-b9f4-4dd9-a0e2-faa669fc3117" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_LongTermDebtMaturitiesCommitmentFeeInYearFive_019c1fb4-0366-7a91-8255-420bee3e3662" xlink:href="form-20251227.xsd#form_LongTermDebtMaturitiesCommitmentFeeInYearFive"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_LongTermDebtMaturitiesTotalPaymentDueYearFive_17113545-5bc2-4ef5-aace-43cafcc5d521" xlink:to="loc_form_LongTermDebtMaturitiesCommitmentFeeInYearFive_019c1fb4-0366-7a91-8255-420bee3e3662" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_LongTermDebtMaturitiesTotalPaymentDueNextTwelveMonths_d4b9df7f-678d-4287-9617-9225cdd82043" xlink:href="form-20251227.xsd#form_LongTermDebtMaturitiesTotalPaymentDueNextTwelveMonths"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_226f5d46-6bd2-4ee9-bd04-5af4aace4b05" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_LongTermDebtMaturitiesTotalPaymentDueNextTwelveMonths_d4b9df7f-678d-4287-9617-9225cdd82043" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_226f5d46-6bd2-4ee9-bd04-5af4aace4b05" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_LongTermDebtMaturitiesPaymentsOfInterestInYearOne_c4e9c413-12a5-467d-a797-55bdbbe95c0c" xlink:href="form-20251227.xsd#form_LongTermDebtMaturitiesPaymentsOfInterestInYearOne"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_LongTermDebtMaturitiesTotalPaymentDueNextTwelveMonths_d4b9df7f-678d-4287-9617-9225cdd82043" xlink:to="loc_form_LongTermDebtMaturitiesPaymentsOfInterestInYearOne_c4e9c413-12a5-467d-a797-55bdbbe95c0c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_LongTermDebtMaturitiesCommitmentFeeInYearOne_019c1fb3-a789-7542-b768-dd655c4a1f71" xlink:href="form-20251227.xsd#form_LongTermDebtMaturitiesCommitmentFeeInYearOne"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_LongTermDebtMaturitiesTotalPaymentDueNextTwelveMonths_d4b9df7f-678d-4287-9617-9225cdd82043" xlink:to="loc_form_LongTermDebtMaturitiesCommitmentFeeInYearOne_019c1fb3-a789-7542-b768-dd655c4a1f71" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_LongTermDebtMaturitiesTotalPaymentDueYearThree_fa733db4-71c2-4e51-acc0-103c24002036" xlink:href="form-20251227.xsd#form_LongTermDebtMaturitiesTotalPaymentDueYearThree"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_38fccd04-df91-40a1-a213-b548139b8860" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_LongTermDebtMaturitiesTotalPaymentDueYearThree_fa733db4-71c2-4e51-acc0-103c24002036" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_38fccd04-df91-40a1-a213-b548139b8860" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_LongTermDebtMaturitiesPaymentsOfInterestDueYearThree_e2c1d60b-c738-4053-829c-301333f290bd" xlink:href="form-20251227.xsd#form_LongTermDebtMaturitiesPaymentsOfInterestDueYearThree"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_LongTermDebtMaturitiesTotalPaymentDueYearThree_fa733db4-71c2-4e51-acc0-103c24002036" xlink:to="loc_form_LongTermDebtMaturitiesPaymentsOfInterestDueYearThree_e2c1d60b-c738-4053-829c-301333f290bd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_LongTermDebtMaturitiesCommitmentFeeInYearThree_019c1fb3-d6e2-795e-8a5f-a3c502d76627" xlink:href="form-20251227.xsd#form_LongTermDebtMaturitiesCommitmentFeeInYearThree"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_LongTermDebtMaturitiesTotalPaymentDueYearThree_fa733db4-71c2-4e51-acc0-103c24002036" xlink:to="loc_form_LongTermDebtMaturitiesCommitmentFeeInYearThree_019c1fb3-d6e2-795e-8a5f-a3c502d76627" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_LongtermDebtMaturitiesInterestPayments_475b2b6a-a435-44a9-b0e6-d0551c8fb72e" xlink:href="form-20251227.xsd#form_LongtermDebtMaturitiesInterestPayments"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_LongTermDebtMaturitiesPaymentsOfInterestInYearOne_e0adfae7-1be7-4b21-b859-7120ce0200b3" xlink:href="form-20251227.xsd#form_LongTermDebtMaturitiesPaymentsOfInterestInYearOne"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_LongtermDebtMaturitiesInterestPayments_475b2b6a-a435-44a9-b0e6-d0551c8fb72e" xlink:to="loc_form_LongTermDebtMaturitiesPaymentsOfInterestInYearOne_e0adfae7-1be7-4b21-b859-7120ce0200b3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_LongtermDebtMaturitiesPaymentsOfInterestInYearTwo_58b58cad-007f-4b65-a379-f2b4b410ae35" xlink:href="form-20251227.xsd#form_LongtermDebtMaturitiesPaymentsOfInterestInYearTwo"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_LongtermDebtMaturitiesInterestPayments_475b2b6a-a435-44a9-b0e6-d0551c8fb72e" xlink:to="loc_form_LongtermDebtMaturitiesPaymentsOfInterestInYearTwo_58b58cad-007f-4b65-a379-f2b4b410ae35" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_LongTermDebtMaturitiesPaymentsOfInterestDueYearThree_6c7ba634-a0ed-4567-baf4-fb654326c6d6" xlink:href="form-20251227.xsd#form_LongTermDebtMaturitiesPaymentsOfInterestDueYearThree"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_LongtermDebtMaturitiesInterestPayments_475b2b6a-a435-44a9-b0e6-d0551c8fb72e" xlink:to="loc_form_LongTermDebtMaturitiesPaymentsOfInterestDueYearThree_6c7ba634-a0ed-4567-baf4-fb654326c6d6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_LongTermDebtMaturitiesPaymentsOfInterestDueYearFour_5ae49ee6-27bc-4f7d-a2ee-956afeb03a95" xlink:href="form-20251227.xsd#form_LongTermDebtMaturitiesPaymentsOfInterestDueYearFour"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_LongtermDebtMaturitiesInterestPayments_475b2b6a-a435-44a9-b0e6-d0551c8fb72e" xlink:to="loc_form_LongTermDebtMaturitiesPaymentsOfInterestDueYearFour_5ae49ee6-27bc-4f7d-a2ee-956afeb03a95" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_LongTermDebtMaturitiesPaymentsOfInterestDueYearFive_b3f7b095-a51c-42b1-915e-6aa5071c4cd2" xlink:href="form-20251227.xsd#form_LongTermDebtMaturitiesPaymentsOfInterestDueYearFive"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_LongtermDebtMaturitiesInterestPayments_475b2b6a-a435-44a9-b0e6-d0551c8fb72e" xlink:to="loc_form_LongTermDebtMaturitiesPaymentsOfInterestDueYearFive_b3f7b095-a51c-42b1-915e-6aa5071c4cd2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_LongTermDebtMaturitiesPaymentsOfInterestDueAfterYearFive_cbfff310-8389-40ad-9a97-f36f740e5e83" xlink:href="form-20251227.xsd#form_LongTermDebtMaturitiesPaymentsOfInterestDueAfterYearFive"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_LongtermDebtMaturitiesInterestPayments_475b2b6a-a435-44a9-b0e6-d0551c8fb72e" xlink:to="loc_form_LongTermDebtMaturitiesPaymentsOfInterestDueAfterYearFive_cbfff310-8389-40ad-9a97-f36f740e5e83" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_LongTermDebtMaturitiesCommitmentFee_019c1fb2-eb4b-79f0-8ec5-2de3291b92af" xlink:href="form-20251227.xsd#form_LongTermDebtMaturitiesCommitmentFee"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_LongTermDebtMaturitiesCommitmentFeeInYearOne_019c1fb2-eb4b-7847-aa20-3ab0203855d8" xlink:href="form-20251227.xsd#form_LongTermDebtMaturitiesCommitmentFeeInYearOne"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_LongTermDebtMaturitiesCommitmentFee_019c1fb2-eb4b-79f0-8ec5-2de3291b92af" xlink:to="loc_form_LongTermDebtMaturitiesCommitmentFeeInYearOne_019c1fb2-eb4b-7847-aa20-3ab0203855d8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_LongTermDebtMaturitiesCommitmentFeeInYearTwo_019c1fb2-eb4b-7278-87de-9b43738a4070" xlink:href="form-20251227.xsd#form_LongTermDebtMaturitiesCommitmentFeeInYearTwo"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_LongTermDebtMaturitiesCommitmentFee_019c1fb2-eb4b-79f0-8ec5-2de3291b92af" xlink:to="loc_form_LongTermDebtMaturitiesCommitmentFeeInYearTwo_019c1fb2-eb4b-7278-87de-9b43738a4070" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_LongTermDebtMaturitiesCommitmentFeeInYearThree_019c1fb2-eb4b-780e-b16c-3c8f593d2a50" xlink:href="form-20251227.xsd#form_LongTermDebtMaturitiesCommitmentFeeInYearThree"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_LongTermDebtMaturitiesCommitmentFee_019c1fb2-eb4b-79f0-8ec5-2de3291b92af" xlink:to="loc_form_LongTermDebtMaturitiesCommitmentFeeInYearThree_019c1fb2-eb4b-780e-b16c-3c8f593d2a50" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_LongTermDebtMaturitiesCommitmentFeeInYearFour_019c1fb2-eb4b-731b-abf1-53db5cae1b7c" xlink:href="form-20251227.xsd#form_LongTermDebtMaturitiesCommitmentFeeInYearFour"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_LongTermDebtMaturitiesCommitmentFee_019c1fb2-eb4b-79f0-8ec5-2de3291b92af" xlink:to="loc_form_LongTermDebtMaturitiesCommitmentFeeInYearFour_019c1fb2-eb4b-731b-abf1-53db5cae1b7c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_LongTermDebtMaturitiesCommitmentFeeInYearFive_019c1fb2-eb4b-78c5-ad31-2d177db5a51f" xlink:href="form-20251227.xsd#form_LongTermDebtMaturitiesCommitmentFeeInYearFive"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_LongTermDebtMaturitiesCommitmentFee_019c1fb2-eb4b-79f0-8ec5-2de3291b92af" xlink:to="loc_form_LongTermDebtMaturitiesCommitmentFeeInYearFive_019c1fb2-eb4b-78c5-ad31-2d177db5a51f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_LongTermDebtMaturitiesCommitmentFeeDueAfterYearFive_019c1fb2-eb4b-735c-af9a-cc5b67ea2966" xlink:href="form-20251227.xsd#form_LongTermDebtMaturitiesCommitmentFeeDueAfterYearFive"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_LongTermDebtMaturitiesCommitmentFee_019c1fb2-eb4b-79f0-8ec5-2de3291b92af" xlink:to="loc_form_LongTermDebtMaturitiesCommitmentFeeDueAfterYearFive_019c1fb2-eb4b-735c-af9a-cc5b67ea2966" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_LongTermDebtMaturitiesTotalPaymentsDue_94f159ca-994e-4013-8e17-35626d152ffc" xlink:href="form-20251227.xsd#form_LongTermDebtMaturitiesTotalPaymentsDue"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_LongTermDebtMaturitiesTotalPaymentDueYearFive_a9a28a3e-334b-4e7a-b2fd-39f4d4da2ec1" xlink:href="form-20251227.xsd#form_LongTermDebtMaturitiesTotalPaymentDueYearFive"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_LongTermDebtMaturitiesTotalPaymentsDue_94f159ca-994e-4013-8e17-35626d152ffc" xlink:to="loc_form_LongTermDebtMaturitiesTotalPaymentDueYearFive_a9a28a3e-334b-4e7a-b2fd-39f4d4da2ec1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_LongTermDebtMaturitiesTotalPaymentDueYearFour_f7e47cf8-a787-48a5-a24d-a4fc82d3695f" xlink:href="form-20251227.xsd#form_LongTermDebtMaturitiesTotalPaymentDueYearFour"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_LongTermDebtMaturitiesTotalPaymentsDue_94f159ca-994e-4013-8e17-35626d152ffc" xlink:to="loc_form_LongTermDebtMaturitiesTotalPaymentDueYearFour_f7e47cf8-a787-48a5-a24d-a4fc82d3695f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_LongTermDebtMaturitiesTotalPaymentDueYearTwo_4cf91063-6d53-4a97-9e11-a98c660fc499" xlink:href="form-20251227.xsd#form_LongTermDebtMaturitiesTotalPaymentDueYearTwo"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_LongTermDebtMaturitiesTotalPaymentsDue_94f159ca-994e-4013-8e17-35626d152ffc" xlink:to="loc_form_LongTermDebtMaturitiesTotalPaymentDueYearTwo_4cf91063-6d53-4a97-9e11-a98c660fc499" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_LongTermDebtMaturitiesTotalPaymentDueAfterYearFive_0b98eb2e-d46b-4cf1-bdaf-c4133d73dd13" xlink:href="form-20251227.xsd#form_LongTermDebtMaturitiesTotalPaymentDueAfterYearFive"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_LongTermDebtMaturitiesTotalPaymentsDue_94f159ca-994e-4013-8e17-35626d152ffc" xlink:to="loc_form_LongTermDebtMaturitiesTotalPaymentDueAfterYearFive_0b98eb2e-d46b-4cf1-bdaf-c4133d73dd13" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_LongTermDebtMaturitiesTotalPaymentDueYearThree_f38c0535-c563-417e-b09f-ac07aea7344a" xlink:href="form-20251227.xsd#form_LongTermDebtMaturitiesTotalPaymentDueYearThree"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_LongTermDebtMaturitiesTotalPaymentsDue_94f159ca-994e-4013-8e17-35626d152ffc" xlink:to="loc_form_LongTermDebtMaturitiesTotalPaymentDueYearThree_f38c0535-c563-417e-b09f-ac07aea7344a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_LongTermDebtMaturitiesTotalPaymentDueNextTwelveMonths_e930d44a-4eb7-46cc-b6cd-d07063164cb1" xlink:href="form-20251227.xsd#form_LongTermDebtMaturitiesTotalPaymentDueNextTwelveMonths"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_LongTermDebtMaturitiesTotalPaymentsDue_94f159ca-994e-4013-8e17-35626d152ffc" xlink:to="loc_form_LongTermDebtMaturitiesTotalPaymentDueNextTwelveMonths_e930d44a-4eb7-46cc-b6cd-d07063164cb1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_LongTermDebtMaturitiesTotalPaymentDueAfterYearFive_ee2e3228-d594-4736-ab71-a109d3df901e" xlink:href="form-20251227.xsd#form_LongTermDebtMaturitiesTotalPaymentDueAfterYearFive"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive_b69b610c-d14d-444a-b6d8-42f065908a12" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_LongTermDebtMaturitiesTotalPaymentDueAfterYearFive_ee2e3228-d594-4736-ab71-a109d3df901e" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive_b69b610c-d14d-444a-b6d8-42f065908a12" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_LongTermDebtMaturitiesPaymentsOfInterestDueAfterYearFive_60fd5459-a594-4643-a680-f06d6cb81496" xlink:href="form-20251227.xsd#form_LongTermDebtMaturitiesPaymentsOfInterestDueAfterYearFive"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_LongTermDebtMaturitiesTotalPaymentDueAfterYearFive_ee2e3228-d594-4736-ab71-a109d3df901e" xlink:to="loc_form_LongTermDebtMaturitiesPaymentsOfInterestDueAfterYearFive_60fd5459-a594-4643-a680-f06d6cb81496" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_LongTermDebtMaturitiesCommitmentFeeDueAfterYearFive_019c1fb4-19b4-7afd-970e-acf657cd9596" xlink:href="form-20251227.xsd#form_LongTermDebtMaturitiesCommitmentFeeDueAfterYearFive"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_LongTermDebtMaturitiesTotalPaymentDueAfterYearFive_ee2e3228-d594-4736-ab71-a109d3df901e" xlink:to="loc_form_LongTermDebtMaturitiesCommitmentFeeDueAfterYearFive_019c1fb4-19b4-7afd-970e-acf657cd9596" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.formfactor.com/role/DebtFuturePrincipleandInterestPaymentsDetails_1" xlink:type="simple" xlink:href="form-20251227.xsd#DebtFuturePrincipleandInterestPaymentsDetails_1"/>
  <link:calculationLink xlink:role="http://www.formfactor.com/role/DebtFuturePrincipleandInterestPaymentsDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_form_LongTermDebtMaturitiesTotalPaymentsDue_d48e0de2-7010-48df-81d5-7c322c4fae3b" xlink:href="form-20251227.xsd#form_LongTermDebtMaturitiesTotalPaymentsDue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_db857a8d-8327-42a5-958e-a4bb722daf11" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_LongTermDebtMaturitiesTotalPaymentsDue_d48e0de2-7010-48df-81d5-7c322c4fae3b" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_db857a8d-8327-42a5-958e-a4bb722daf11" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_LongtermDebtMaturitiesInterestPayments_cc387803-a097-4793-a6b0-d8182523d975" xlink:href="form-20251227.xsd#form_LongtermDebtMaturitiesInterestPayments"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_LongTermDebtMaturitiesTotalPaymentsDue_d48e0de2-7010-48df-81d5-7c322c4fae3b" xlink:to="loc_form_LongtermDebtMaturitiesInterestPayments_cc387803-a097-4793-a6b0-d8182523d975" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_LongTermDebtMaturitiesCommitmentFee_019c1fb4-4fa7-72cc-921a-bfc9253246ce" xlink:href="form-20251227.xsd#form_LongTermDebtMaturitiesCommitmentFee"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_LongTermDebtMaturitiesTotalPaymentsDue_d48e0de2-7010-48df-81d5-7c322c4fae3b" xlink:to="loc_form_LongTermDebtMaturitiesCommitmentFee_019c1fb4-4fa7-72cc-921a-bfc9253246ce" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.formfactor.com/role/LeasesComponentsofLeaseExpenseDetails" xlink:type="simple" xlink:href="form-20251227.xsd#LeasesComponentsofLeaseExpenseDetails"/>
  <link:calculationLink xlink:role="http://www.formfactor.com/role/LeasesComponentsofLeaseExpenseDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseCost_14076779-d535-4ed4-857c-e7981e7b1c07" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LeaseCost"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseCost_5c8f54f4-d361-40b8-b1f3-3a426dd14448" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseCost"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseCost_14076779-d535-4ed4-857c-e7981e7b1c07" xlink:to="loc_us-gaap_OperatingLeaseCost_5c8f54f4-d361-40b8-b1f3-3a426dd14448" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableLeaseCost_92f53b91-cfa9-4136-8cbb-9b8b37c0cbbf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableLeaseCost"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseCost_14076779-d535-4ed4-857c-e7981e7b1c07" xlink:to="loc_us-gaap_VariableLeaseCost_92f53b91-cfa9-4136-8cbb-9b8b37c0cbbf" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermLeaseCost_994dbb41-fc1b-4b57-bdd1-b4d8f7b8d1b5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShortTermLeaseCost"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseCost_14076779-d535-4ed4-857c-e7981e7b1c07" xlink:to="loc_us-gaap_ShortTermLeaseCost_994dbb41-fc1b-4b57-bdd1-b4d8f7b8d1b5" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.formfactor.com/role/LeasesScheduleofFutureMinimumPaymentsUnderLeasesDetails" xlink:type="simple" xlink:href="form-20251227.xsd#LeasesScheduleofFutureMinimumPaymentsUnderLeasesDetails"/>
  <link:calculationLink xlink:role="http://www.formfactor.com/role/LeasesScheduleofFutureMinimumPaymentsUnderLeasesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_78918677-f9af-46db-a665-6024bfbed430" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_3fa61c70-2709-471b-a189-c33af714efe3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_78918677-f9af-46db-a665-6024bfbed430" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_3fa61c70-2709-471b-a189-c33af714efe3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_5c6daa9b-1548-48e6-85f5-24ff7e3a26a3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_78918677-f9af-46db-a665-6024bfbed430" xlink:to="loc_us-gaap_OperatingLeaseLiability_5c6daa9b-1548-48e6-85f5-24ff7e3a26a3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_8686ab73-3d63-4d56-a23b-5e3a1f3e4ca7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_3df101d5-4424-4c34-bf65-4609f9d8cee1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingLeaseLiability_8686ab73-3d63-4d56-a23b-5e3a1f3e4ca7" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_3df101d5-4424-4c34-bf65-4609f9d8cee1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_7feac897-d36e-4e55-bc5b-5e5240236e57" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseLiabilityCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingLeaseLiability_8686ab73-3d63-4d56-a23b-5e3a1f3e4ca7" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrent_7feac897-d36e-4e55-bc5b-5e5240236e57" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.formfactor.com/role/LeasesScheduleofFutureMinimumPaymentsUnderLeasesDetails_1" xlink:type="simple" xlink:href="form-20251227.xsd#LeasesScheduleofFutureMinimumPaymentsUnderLeasesDetails_1"/>
  <link:calculationLink xlink:role="http://www.formfactor.com/role/LeasesScheduleofFutureMinimumPaymentsUnderLeasesDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_bdd05145-7d0d-47ed-9663-97e0fa430693" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_5ce355be-6626-40fb-b7ba-d79642156f1c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_bdd05145-7d0d-47ed-9663-97e0fa430693" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_5ce355be-6626-40fb-b7ba-d79642156f1c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_2c34a6c4-3fda-434a-8e0c-c4e2acaef9a6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_bdd05145-7d0d-47ed-9663-97e0fa430693" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_2c34a6c4-3fda-434a-8e0c-c4e2acaef9a6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_4c3cdc03-23fb-4471-b390-bd3683c20997" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_bdd05145-7d0d-47ed-9663-97e0fa430693" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_4c3cdc03-23fb-4471-b390-bd3683c20997" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_9379dba8-a32d-4bf6-9993-cd961f3fc867" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_bdd05145-7d0d-47ed-9663-97e0fa430693" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_9379dba8-a32d-4bf6-9993-cd961f3fc867" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_7e04e637-d961-4e71-9886-59e34bdad9d0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_bdd05145-7d0d-47ed-9663-97e0fa430693" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_7e04e637-d961-4e71-9886-59e34bdad9d0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_22a93095-7dc7-4362-8e41-733fa65023ff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_bdd05145-7d0d-47ed-9663-97e0fa430693" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_22a93095-7dc7-4362-8e41-733fa65023ff" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.formfactor.com/role/FairValueAssetsandLiabilitiesMeasuredatFairValueonaRecurringBasisDetails" xlink:type="simple" xlink:href="form-20251227.xsd#FairValueAssetsandLiabilitiesMeasuredatFairValueonaRecurringBasisDetails"/>
  <link:calculationLink xlink:role="http://www.formfactor.com/role/FairValueAssetsandLiabilitiesMeasuredatFairValueonaRecurringBasisDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_2f3e380f-786f-4e3e-8904-1ea97bde6f00" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsFairValueDisclosure"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_015210ae-90f3-4e3b-827f-18bcbe90ef4e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsFairValueDisclosure"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsFairValueDisclosure_2f3e380f-786f-4e3e-8904-1ea97bde6f00" xlink:to="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_015210ae-90f3-4e3b-827f-18bcbe90ef4e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketableSecurities_c9960cf1-5cab-4f49-aa31-9cd17f6a9b09" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketableSecurities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsFairValueDisclosure_2f3e380f-786f-4e3e-8904-1ea97bde6f00" xlink:to="loc_us-gaap_MarketableSecurities_c9960cf1-5cab-4f49-aa31-9cd17f6a9b09" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_a127e4f4-559c-4bd1-a762-cd6c47686ad0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeAssets"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsFairValueDisclosure_2f3e380f-786f-4e3e-8904-1ea97bde6f00" xlink:to="loc_us-gaap_DerivativeAssets_a127e4f4-559c-4bd1-a762-cd6c47686ad0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_53fa4975-8b58-4b81-b2d5-6728539bde8a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesFairValueDisclosure"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_aed4a0ca-ba17-4aa1-b35f-7b59ee4b1619" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeLiabilities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosure_53fa4975-8b58-4b81-b2d5-6728539bde8a" xlink:to="loc_us-gaap_DerivativeLiabilities_aed4a0ca-ba17-4aa1-b35f-7b59ee4b1619" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.formfactor.com/role/GoodwillandIntangibleAssetsIntangibleAssetsDetails" xlink:type="simple" xlink:href="form-20251227.xsd#GoodwillandIntangibleAssetsIntangibleAssetsDetails"/>
  <link:calculationLink xlink:role="http://www.formfactor.com/role/GoodwillandIntangibleAssetsIntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_4ece6543-df66-4d73-8ddf-8daf8e6c86d3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_a385f6f9-d7f6-4b65-a340-b19beb238f25" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_4ece6543-df66-4d73-8ddf-8daf8e6c86d3" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_a385f6f9-d7f6-4b65-a340-b19beb238f25" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_cbaa73d4-fcaa-48f8-9aa0-46393f7fb8f7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_4ece6543-df66-4d73-8ddf-8daf8e6c86d3" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_cbaa73d4-fcaa-48f8-9aa0-46393f7fb8f7" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.formfactor.com/role/GoodwillandIntangibleAssetsAmortizationExpenseDetails" xlink:type="simple" xlink:href="form-20251227.xsd#GoodwillandIntangibleAssetsAmortizationExpenseDetails"/>
  <link:calculationLink xlink:role="http://www.formfactor.com/role/GoodwillandIntangibleAssetsAmortizationExpenseDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_form_FiniteLivedIntangibleAssetsAmortizationExpenseTotal_5ea507c9-ec8f-4796-bbe0-054091b3da20" xlink:href="form-20251227.xsd#form_FiniteLivedIntangibleAssetsAmortizationExpenseTotal"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_62886756-cd9a-4815-bc5c-6de026f2ca1a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_FiniteLivedIntangibleAssetsAmortizationExpenseTotal_5ea507c9-ec8f-4796-bbe0-054091b3da20" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_62886756-cd9a-4815-bc5c-6de026f2ca1a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_42526763-9c47-4f3f-b91d-8a052dc81a38" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_FiniteLivedIntangibleAssetsAmortizationExpenseTotal_5ea507c9-ec8f-4796-bbe0-054091b3da20" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_42526763-9c47-4f3f-b91d-8a052dc81a38" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_53d43fe9-df1c-4c7b-908f-93e85926db93" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_FiniteLivedIntangibleAssetsAmortizationExpenseTotal_5ea507c9-ec8f-4796-bbe0-054091b3da20" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_53d43fe9-df1c-4c7b-908f-93e85926db93" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive_aa76c91e-38cc-4e68-a524-a8a548b9e921" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_FiniteLivedIntangibleAssetsAmortizationExpenseTotal_5ea507c9-ec8f-4796-bbe0-054091b3da20" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive_aa76c91e-38cc-4e68-a524-a8a548b9e921" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_83a34dda-c831-48d5-adee-6bb4f4ad9e26" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_FiniteLivedIntangibleAssetsAmortizationExpenseTotal_5ea507c9-ec8f-4796-bbe0-054091b3da20" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_83a34dda-c831-48d5-adee-6bb4f4ad9e26" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_47d37e27-e249-4cc2-acab-4d1dc4c68fc4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_FiniteLivedIntangibleAssetsAmortizationExpenseTotal_5ea507c9-ec8f-4796-bbe0-054091b3da20" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_47d37e27-e249-4cc2-acab-4d1dc4c68fc4" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.formfactor.com/role/IncomeTaxesComponentsofIncomeBeforeIncomeTaxesDetails" xlink:type="simple" xlink:href="form-20251227.xsd#IncomeTaxesComponentsofIncomeBeforeIncomeTaxesDetails"/>
  <link:calculationLink xlink:role="http://www.formfactor.com/role/IncomeTaxesComponentsofIncomeBeforeIncomeTaxesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_a91571a5-95f8-4963-a8bf-32ee45e5f635" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic_a508d4b9-467a-43fb-b77d-99e06fb41953" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_a91571a5-95f8-4963-a8bf-32ee45e5f635" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic_a508d4b9-467a-43fb-b77d-99e06fb41953" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign_46f5c7c2-5499-48ab-bb9e-5b95934a0839" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_a91571a5-95f8-4963-a8bf-32ee45e5f635" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign_46f5c7c2-5499-48ab-bb9e-5b95934a0839" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.formfactor.com/role/IncomeTaxesProvisionforIncomeTaxesDetails" xlink:type="simple" xlink:href="form-20251227.xsd#IncomeTaxesProvisionforIncomeTaxesDetails"/>
  <link:calculationLink xlink:role="http://www.formfactor.com/role/IncomeTaxesProvisionforIncomeTaxesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_f2c6b2ba-5678-4dff-a420-69a8aff6ca5a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CurrentIncomeTaxExpenseBenefit"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrentFederalTaxExpenseBenefit_d7ec19a8-60eb-4266-846d-1e23e2520142" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CurrentFederalTaxExpenseBenefit"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_f2c6b2ba-5678-4dff-a420-69a8aff6ca5a" xlink:to="loc_us-gaap_CurrentFederalTaxExpenseBenefit_d7ec19a8-60eb-4266-846d-1e23e2520142" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrentStateAndLocalTaxExpenseBenefit_94ddd2eb-6f77-41c8-924f-d9c677ceb910" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CurrentStateAndLocalTaxExpenseBenefit"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_f2c6b2ba-5678-4dff-a420-69a8aff6ca5a" xlink:to="loc_us-gaap_CurrentStateAndLocalTaxExpenseBenefit_94ddd2eb-6f77-41c8-924f-d9c677ceb910" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrentForeignTaxExpenseBenefit_89b28cda-d263-454e-8a01-84d637a4c3cb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CurrentForeignTaxExpenseBenefit"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_f2c6b2ba-5678-4dff-a420-69a8aff6ca5a" xlink:to="loc_us-gaap_CurrentForeignTaxExpenseBenefit_89b28cda-d263-454e-8a01-84d637a4c3cb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_e6f11a9c-3039-4b10-8f38-4777a4cde858" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations_a654951f-9f5d-45ae-aff9-775e166287b8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_e6f11a9c-3039-4b10-8f38-4777a4cde858" xlink:to="loc_us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations_a654951f-9f5d-45ae-aff9-775e166287b8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations_bd9a7efa-3f79-48a8-8463-52180e552622" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_e6f11a9c-3039-4b10-8f38-4777a4cde858" xlink:to="loc_us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations_bd9a7efa-3f79-48a8-8463-52180e552622" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations_019c53ab-0679-7ffd-add6-6605a1212ff5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_e6f11a9c-3039-4b10-8f38-4777a4cde858" xlink:to="loc_us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations_019c53ab-0679-7ffd-add6-6605a1212ff5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_DeferredIncomeTaxExpenseBenefitTotal_a6a186f8-d6a6-4087-8be5-e8cedf390e46" xlink:href="form-20251227.xsd#form_DeferredIncomeTaxExpenseBenefitTotal"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFederalIncomeTaxExpenseBenefit_43a1b7ff-e228-4f53-b39c-6526af63d39a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredFederalIncomeTaxExpenseBenefit"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_DeferredIncomeTaxExpenseBenefitTotal_a6a186f8-d6a6-4087-8be5-e8cedf390e46" xlink:to="loc_us-gaap_DeferredFederalIncomeTaxExpenseBenefit_43a1b7ff-e228-4f53-b39c-6526af63d39a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit_a612977a-3001-4e96-81c7-852f35fc3e43" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_DeferredIncomeTaxExpenseBenefitTotal_a6a186f8-d6a6-4087-8be5-e8cedf390e46" xlink:to="loc_us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit_a612977a-3001-4e96-81c7-852f35fc3e43" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredForeignIncomeTaxExpenseBenefit_df6fd69f-8a87-4f1f-ba7d-fcea0da88727" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredForeignIncomeTaxExpenseBenefit"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_DeferredIncomeTaxExpenseBenefitTotal_a6a186f8-d6a6-4087-8be5-e8cedf390e46" xlink:to="loc_us-gaap_DeferredForeignIncomeTaxExpenseBenefit_df6fd69f-8a87-4f1f-ba7d-fcea0da88727" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.formfactor.com/role/IncomeTaxesTaxRateReconciliationDetails" xlink:type="simple" xlink:href="form-20251227.xsd#IncomeTaxesTaxRateReconciliationDetails"/>
  <link:calculationLink xlink:role="http://www.formfactor.com/role/IncomeTaxesTaxRateReconciliationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_979ccf97-179e-4a40-ab93-592f4cc56420" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate_f8a33668-b342-45ac-b6fd-147ecd01fc60" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_979ccf97-179e-4a40-ab93-592f4cc56420" xlink:to="loc_us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate_f8a33668-b342-45ac-b6fd-147ecd01fc60" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes_2e4f2ed5-dee2-491d-9cdf-6006ea898915" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_979ccf97-179e-4a40-ab93-592f4cc56420" xlink:to="loc_us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes_2e4f2ed5-dee2-491d-9cdf-6006ea898915" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential_3c268a83-decc-4283-92ee-729102975377" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_979ccf97-179e-4a40-ab93-592f4cc56420" xlink:to="loc_us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential_3c268a83-decc-4283-92ee-729102975377" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_EffectiveIncomeTaxRateReconciliationForeignGainExclusionAmount_4852a2b8-6e2e-49b9-af0f-d421bbe52701" xlink:href="form-20251227.xsd#form_EffectiveIncomeTaxRateReconciliationForeignGainExclusionAmount"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_979ccf97-179e-4a40-ab93-592f4cc56420" xlink:to="loc_form_EffectiveIncomeTaxRateReconciliationForeignGainExclusionAmount_4852a2b8-6e2e-49b9-af0f-d421bbe52701" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationOtherAdjustments_6562a277-eeab-4eed-b9c4-8ef8632ae97f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxReconciliationOtherAdjustments"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_979ccf97-179e-4a40-ab93-592f4cc56420" xlink:to="loc_us-gaap_IncomeTaxReconciliationOtherAdjustments_6562a277-eeab-4eed-b9c4-8ef8632ae97f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseReversalOfGainLossOnSaleAmount_c77bb8ef-1871-499d-89db-033409c5b288" xlink:href="form-20251227.xsd#form_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseReversalOfGainLossOnSaleAmount"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_979ccf97-179e-4a40-ab93-592f4cc56420" xlink:to="loc_form_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseReversalOfGainLossOnSaleAmount_c77bb8ef-1871-499d-89db-033409c5b288" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationTaxSettlementsForeign_91f7a94e-a89a-449e-9772-4cf3b0d48631" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxReconciliationTaxSettlementsForeign"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_979ccf97-179e-4a40-ab93-592f4cc56420" xlink:to="loc_us-gaap_IncomeTaxReconciliationTaxSettlementsForeign_91f7a94e-a89a-449e-9772-4cf3b0d48631" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationGiltiAmount_d8b3adb4-903c-439a-95b2-637fe7820ba4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationGiltiAmount"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_979ccf97-179e-4a40-ab93-592f4cc56420" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationGiltiAmount_d8b3adb4-903c-439a-95b2-637fe7820ba4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationFdiiAmount_7f47fc5d-3015-484e-9b03-8aee9f9a5c43" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationFdiiAmount"/>
    <link:calculationArc order="9" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_979ccf97-179e-4a40-ab93-592f4cc56420" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationFdiiAmount_7f47fc5d-3015-484e-9b03-8aee9f9a5c43" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationCrossBorderOtherAmount_04fe875c-4250-44bf-bd10-c33600fff408" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationCrossBorderOtherAmount"/>
    <link:calculationArc order="10" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_979ccf97-179e-4a40-ab93-592f4cc56420" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationCrossBorderOtherAmount_04fe875c-4250-44bf-bd10-c33600fff408" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationTaxCreditsResearch_131f2202-c62c-451f-8ae1-f9ba9f7644e1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxReconciliationTaxCreditsResearch"/>
    <link:calculationArc order="11" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_979ccf97-179e-4a40-ab93-592f4cc56420" xlink:to="loc_us-gaap_IncomeTaxReconciliationTaxCreditsResearch_131f2202-c62c-451f-8ae1-f9ba9f7644e1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationTaxCreditsOther_161ea01a-b5a2-4aec-9618-3abc3c9ea1a5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxReconciliationTaxCreditsOther"/>
    <link:calculationArc order="12" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_979ccf97-179e-4a40-ab93-592f4cc56420" xlink:to="loc_us-gaap_IncomeTaxReconciliationTaxCreditsOther_161ea01a-b5a2-4aec-9618-3abc3c9ea1a5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance_48c034be-3f17-4936-8d26-2785675c1865" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance"/>
    <link:calculationArc order="13" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_979ccf97-179e-4a40-ab93-592f4cc56420" xlink:to="loc_us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance_48c034be-3f17-4936-8d26-2785675c1865" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseEquityCompensationAmount_694d83c5-de45-46ed-9163-8df9647e9798" xlink:href="form-20251227.xsd#form_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseEquityCompensationAmount"/>
    <link:calculationArc order="14" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_979ccf97-179e-4a40-ab93-592f4cc56420" xlink:to="loc_form_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseEquityCompensationAmount_694d83c5-de45-46ed-9163-8df9647e9798" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost_019c5398-2b0a-763f-ba92-3ee8e6eee92a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost"/>
    <link:calculationArc order="15" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_979ccf97-179e-4a40-ab93-592f4cc56420" xlink:to="loc_us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost_019c5398-2b0a-763f-ba92-3ee8e6eee92a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther_019c5398-2b0a-7465-a4d0-60240c2307b9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther"/>
    <link:calculationArc order="16" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_979ccf97-179e-4a40-ab93-592f4cc56420" xlink:to="loc_us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther_019c5398-2b0a-7465-a4d0-60240c2307b9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationTaxContingencies_019c5398-2b0a-7ad3-86dd-26c92f4d91b1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxReconciliationTaxContingencies"/>
    <link:calculationArc order="17" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_979ccf97-179e-4a40-ab93-592f4cc56420" xlink:to="loc_us-gaap_IncomeTaxReconciliationTaxContingencies_019c5398-2b0a-7ad3-86dd-26c92f4d91b1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_019c5398-9d38-7f3c-9896-32da54240f02" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateContinuingOperations"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_019c5398-9d38-726d-8bbf-76ad1f7fb39b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_019c5398-9d38-7f3c-9896-32da54240f02" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_019c5398-9d38-726d-8bbf-76ad1f7fb39b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes_019c5398-9d38-7b8c-a59b-f091e12e8c56" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_019c5398-9d38-7f3c-9896-32da54240f02" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes_019c5398-9d38-7b8c-a59b-f091e12e8c56" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential_019c5398-9d38-709f-ac16-2bb3ef60871c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_019c5398-9d38-7f3c-9896-32da54240f02" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential_019c5398-9d38-709f-ac16-2bb3ef60871c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_EffectiveIncomeTaxRateReconciliationForeignGainExclusionPercent_019c5398-9d38-716a-bac1-f1b6708d39a2" xlink:href="form-20251227.xsd#form_EffectiveIncomeTaxRateReconciliationForeignGainExclusionPercent"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_019c5398-9d38-7f3c-9896-32da54240f02" xlink:to="loc_form_EffectiveIncomeTaxRateReconciliationForeignGainExclusionPercent_019c5398-9d38-716a-bac1-f1b6708d39a2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments_019c5398-9d38-7010-8c73-5a1cae3b3435" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_019c5398-9d38-7f3c-9896-32da54240f02" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments_019c5398-9d38-7010-8c73-5a1cae3b3435" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseReversalOfGainLossOnSalePercent_019c5398-9d38-7d80-acc9-29d9c39d3abe" xlink:href="form-20251227.xsd#form_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseReversalOfGainLossOnSalePercent"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_019c5398-9d38-7f3c-9896-32da54240f02" xlink:to="loc_form_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseReversalOfGainLossOnSalePercent_019c5398-9d38-7d80-acc9-29d9c39d3abe" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlementsForeign_019c5398-9d38-75bf-9091-0a58194c5dee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlementsForeign"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_019c5398-9d38-7f3c-9896-32da54240f02" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlementsForeign_019c5398-9d38-75bf-9091-0a58194c5dee" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationGiltiPercent_019c5398-9d38-78f7-9716-40c6d9ec232f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationGiltiPercent"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_019c5398-9d38-7f3c-9896-32da54240f02" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationGiltiPercent_019c5398-9d38-78f7-9716-40c6d9ec232f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationFdiiPercent_019c5398-9d38-7948-a4f4-905b3310eb6f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationFdiiPercent"/>
    <link:calculationArc order="9" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_019c5398-9d38-7f3c-9896-32da54240f02" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationFdiiPercent_019c5398-9d38-7948-a4f4-905b3310eb6f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationCrossBorderOtherPercent_019c5398-9d38-72d3-b0aa-6eb6d691898e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationCrossBorderOtherPercent"/>
    <link:calculationArc order="10" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_019c5398-9d38-7f3c-9896-32da54240f02" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationCrossBorderOtherPercent_019c5398-9d38-72d3-b0aa-6eb6d691898e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch_019c5398-9d38-748d-9491-556d82c05314" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch"/>
    <link:calculationArc order="11" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_019c5398-9d38-7f3c-9896-32da54240f02" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch_019c5398-9d38-748d-9491-556d82c05314" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsOther_019c5398-9d38-75b6-901d-43d193777068" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsOther"/>
    <link:calculationArc order="12" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_019c5398-9d38-7f3c-9896-32da54240f02" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsOther_019c5398-9d38-75b6-901d-43d193777068" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance_019c5398-9d38-7d81-86bf-c21b215d25a0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance"/>
    <link:calculationArc order="13" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_019c5398-9d38-7f3c-9896-32da54240f02" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance_019c5398-9d38-7d81-86bf-c21b215d25a0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseEquityCompensationPercent_019c5398-9d38-7b3d-b140-84fd67b4ff9d" xlink:href="form-20251227.xsd#form_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseEquityCompensationPercent"/>
    <link:calculationArc order="14" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_019c5398-9d38-7f3c-9896-32da54240f02" xlink:to="loc_form_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseEquityCompensationPercent_019c5398-9d38-7b3d-b140-84fd67b4ff9d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost_019c5398-9d38-75c3-b25c-e096ced0244f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost"/>
    <link:calculationArc order="15" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_019c5398-9d38-7f3c-9896-32da54240f02" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost_019c5398-9d38-75c3-b25c-e096ced0244f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther_019c5398-9d38-73ee-8f7d-9001d264bdf4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther"/>
    <link:calculationArc order="16" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_019c5398-9d38-7f3c-9896-32da54240f02" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther_019c5398-9d38-73ee-8f7d-9001d264bdf4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies_019c5398-9d38-7703-ba5c-ab3f04f6ab10" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies"/>
    <link:calculationArc order="17" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_019c5398-9d38-7f3c-9896-32da54240f02" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies_019c5398-9d38-7703-ba5c-ab3f04f6ab10" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.formfactor.com/role/IncomeTaxesDeferredTaxAssetsandLiabilitiesDetails" xlink:type="simple" xlink:href="form-20251227.xsd#IncomeTaxesDeferredTaxAssetsandLiabilitiesDetails"/>
  <link:calculationLink xlink:role="http://www.formfactor.com/role/IncomeTaxesDeferredTaxAssetsandLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsNet_01bc8d3a-5387-4778-8a83-a2a403d082c4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxAssetsNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsGross_a0548e0d-7a55-44df-879f-929b7a82c93d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxAssetsGross"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsNet_01bc8d3a-5387-4778-8a83-a2a403d082c4" xlink:to="loc_us-gaap_DeferredTaxAssetsGross_a0548e0d-7a55-44df-879f-929b7a82c93d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsValuationAllowance_35ee3b57-7727-426b-8e98-d9a7e94e4717" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxAssetsValuationAllowance"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsNet_01bc8d3a-5387-4778-8a83-a2a403d082c4" xlink:to="loc_us-gaap_DeferredTaxAssetsValuationAllowance_35ee3b57-7727-426b-8e98-d9a7e94e4717" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsGross_d8bda959-b7ea-4762-8bd1-ea686a8192d9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxAssetsGross"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxCreditCarryforwards_cc2cde0c-df7b-4363-8637-eed4334f14ec" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxAssetsTaxCreditCarryforwards"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_d8bda959-b7ea-4762-8bd1-ea686a8192d9" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxCreditCarryforwards_cc2cde0c-df7b-4363-8637-eed4334f14ec" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost_52fe04ca-0ac2-48c3-a0aa-c8fb8647cd87" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_d8bda959-b7ea-4762-8bd1-ea686a8192d9" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost_52fe04ca-0ac2-48c3-a0aa-c8fb8647cd87" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_DeferredTaxAssetsLeaseLiability_6690d9e2-79d0-4cc5-bf8d-88d8666ba382" xlink:href="form-20251227.xsd#form_DeferredTaxAssetsLeaseLiability"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_d8bda959-b7ea-4762-8bd1-ea686a8192d9" xlink:to="loc_form_DeferredTaxAssetsLeaseLiability_6690d9e2-79d0-4cc5-bf8d-88d8666ba382" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsInventory_2b6bc4fa-c2ae-47dd-9b9b-0d6ac5b4c69b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxAssetsInventory"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_d8bda959-b7ea-4762-8bd1-ea686a8192d9" xlink:to="loc_us-gaap_DeferredTaxAssetsInventory_2b6bc4fa-c2ae-47dd-9b9b-0d6ac5b4c69b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment_5dd78b97-adec-47c4-8de0-6974f310f2b3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_d8bda959-b7ea-4762-8bd1-ea686a8192d9" xlink:to="loc_us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment_5dd78b97-adec-47c4-8de0-6974f310f2b3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsOperatingLossCarryforwards_e16a9a86-96f4-4072-978a-e341e89c67b8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxAssetsOperatingLossCarryforwards"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_d8bda959-b7ea-4762-8bd1-ea686a8192d9" xlink:to="loc_us-gaap_DeferredTaxAssetsOperatingLossCarryforwards_e16a9a86-96f4-4072-978a-e341e89c67b8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther_de0a325f-38c9-4a5c-9c13-d3d2b05fbb88" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_d8bda959-b7ea-4762-8bd1-ea686a8192d9" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther_de0a325f-38c9-4a5c-9c13-d3d2b05fbb88" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsLiabilitiesNet_999a99c7-11d4-4741-a349-4a6588125f19" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxAssetsLiabilitiesNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilities_fbb7d8c3-4df4-40c8-85b2-f882a33b86cf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredIncomeTaxLiabilities"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsLiabilitiesNet_999a99c7-11d4-4741-a349-4a6588125f19" xlink:to="loc_us-gaap_DeferredIncomeTaxLiabilities_fbb7d8c3-4df4-40c8-85b2-f882a33b86cf" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsNet_99684bbf-3467-49a3-a1f5-98db4d6f5c49" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxAssetsNet"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsLiabilitiesNet_999a99c7-11d4-4741-a349-4a6588125f19" xlink:to="loc_us-gaap_DeferredTaxAssetsNet_99684bbf-3467-49a3-a1f5-98db4d6f5c49" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilities_9ea488e8-18b4-4542-a8f7-c9bec64c1ede" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredIncomeTaxLiabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_DeferredTaxLiabilitiesAcquiredIntangiblesAndFixedAssets_28630eed-1fac-47d0-9a73-2cabbf21deb6" xlink:href="form-20251227.xsd#form_DeferredTaxLiabilitiesAcquiredIntangiblesAndFixedAssets"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxLiabilities_9ea488e8-18b4-4542-a8f7-c9bec64c1ede" xlink:to="loc_form_DeferredTaxLiabilitiesAcquiredIntangiblesAndFixedAssets_28630eed-1fac-47d0-9a73-2cabbf21deb6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_form_DeferredTaxLiabilitiesRightOfUseAsset_42ab081f-1887-4cba-aa9e-ad9f888474b9" xlink:href="form-20251227.xsd#form_DeferredTaxLiabilitiesRightOfUseAsset"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxLiabilities_9ea488e8-18b4-4542-a8f7-c9bec64c1ede" xlink:to="loc_form_DeferredTaxLiabilitiesRightOfUseAsset_42ab081f-1887-4cba-aa9e-ad9f888474b9" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.formfactor.com/role/IncomeTaxesTaxesPaidDetails" xlink:type="simple" xlink:href="form-20251227.xsd#IncomeTaxesTaxesPaidDetails"/>
  <link:calculationLink xlink:role="http://www.formfactor.com/role/IncomeTaxesTaxesPaidDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxesPaidNet_019c4461-23ad-7bff-a71c-d5e351913787" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxesPaidNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxPaidFederalAfterRefundReceived_019c4461-23ad-7833-8ca7-531e1e08060e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxPaidFederalAfterRefundReceived"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxesPaidNet_019c4461-23ad-7bff-a71c-d5e351913787" xlink:to="loc_us-gaap_IncomeTaxPaidFederalAfterRefundReceived_019c4461-23ad-7833-8ca7-531e1e08060e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxPaidStateAndLocalAfterRefundReceived_019c4461-23ad-7a4c-b2d1-009204286936" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxPaidStateAndLocalAfterRefundReceived"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxesPaidNet_019c4461-23ad-7bff-a71c-d5e351913787" xlink:to="loc_us-gaap_IncomeTaxPaidStateAndLocalAfterRefundReceived_019c4461-23ad-7a4c-b2d1-009204286936" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxPaidForeignAfterRefundReceived_019c4461-23ad-7123-8af4-69ec07fd1bbd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxPaidForeignAfterRefundReceived"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxesPaidNet_019c4461-23ad-7bff-a71c-d5e351913787" xlink:to="loc_us-gaap_IncomeTaxPaidForeignAfterRefundReceived_019c4461-23ad-7123-8af4-69ec07fd1bbd" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.formfactor.com/role/SegmentsandGeographicInformationOperatingResultsBySegmentDetails" xlink:type="simple" xlink:href="form-20251227.xsd#SegmentsandGeographicInformationOperatingResultsBySegmentDetails"/>
  <link:calculationLink xlink:role="http://www.formfactor.com/role/SegmentsandGeographicInformationOperatingResultsBySegmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_form_NetContribution_a4ff362f-8a70-45b1-b2fd-a03335c40833" xlink:href="form-20251227.xsd#form_NetContribution"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpense_8efb66b1-f255-4cd2-8cce-64fa66d1036b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResearchAndDevelopmentExpense"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_NetContribution_a4ff362f-8a70-45b1-b2fd-a03335c40833" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpense_8efb66b1-f255-4cd2-8cce-64fa66d1036b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingExpense_965a4268-e5d5-48f2-9fc1-140fb8e0127e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SellingExpense"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_NetContribution_a4ff362f-8a70-45b1-b2fd-a03335c40833" xlink:to="loc_us-gaap_SellingExpense_965a4268-e5d5-48f2-9fc1-140fb8e0127e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_1ae6640a-16b0-49c2-a77b-f7ba6f1fb5e0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GrossProfit"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_NetContribution_a4ff362f-8a70-45b1-b2fd-a03335c40833" xlink:to="loc_us-gaap_GrossProfit_1ae6640a-16b0-49c2-a77b-f7ba6f1fb5e0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketingExpense_870464d5-9771-4bd6-b12b-696d0b016b85" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketingExpense"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_form_NetContribution_a4ff362f-8a70-45b1-b2fd-a03335c40833" xlink:to="loc_us-gaap_MarketingExpense_870464d5-9771-4bd6-b12b-696d0b016b85" xlink:type="arc"/>
  </link:calculationLink>
</link:linkbase>
