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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019fd3cf-e28f-7483-afc1-5356c4bf895a,g:c763bad5-9dcd-4621-9ad1-306bc4de2aca-->
<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:arcroleRef arcroleURI="https://xbrl.org/2023/arcrole/summation-item" xlink:type="simple" xlink:href="https://www.xbrl.org/2023/calculation-1.1.xsd#summation-item"/>
  <link:roleRef roleURI="http://fastly.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETS" xlink:type="simple" xlink:href="fsly-20260930.xsd#CONDENSEDCONSOLIDATEDBALANCESHEETS"/>
  <link:calculationLink xlink:role="http://fastly.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019fd3cf-e321-779d-ad81-0b34b5bca024" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_019fd3cf-e321-79ed-b793-312662b28411" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_019fd3cf-e321-779d-ad81-0b34b5bca024" xlink:to="loc_us-gaap_CommonStockValue_019fd3cf-e321-79ed-b793-312662b28411" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapital_019fd3cf-e321-730d-aa97-6a53ee325871" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdditionalPaidInCapital"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_019fd3cf-e321-779d-ad81-0b34b5bca024" xlink:to="loc_us-gaap_AdditionalPaidInCapital_019fd3cf-e321-730d-aa97-6a53ee325871" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_019fd3cf-e321-72b2-96c9-1ae74e2168d9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_019fd3cf-e321-779d-ad81-0b34b5bca024" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_019fd3cf-e321-72b2-96c9-1ae74e2168d9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_019fd3cf-e321-702b-b0de-31e7b6d21272" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_019fd3cf-e321-779d-ad81-0b34b5bca024" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_019fd3cf-e321-702b-b0de-31e7b6d21272" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_019fd3cf-e321-7063-95fe-f0fdbb26598b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Assets"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_019fd3cf-e321-7ae1-a294-5f8a12cffb29" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019fd3cf-e321-7063-95fe-f0fdbb26598b" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_019fd3cf-e321-7ae1-a294-5f8a12cffb29" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_019fd3cf-e321-78ae-85ee-0a876438aa7b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019fd3cf-e321-7063-95fe-f0fdbb26598b" xlink:to="loc_us-gaap_AssetsCurrent_019fd3cf-e321-78ae-85ee-0a876438aa7b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_019fd3cf-e321-7d10-8bbe-78ba2842e508" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherAssetsNoncurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019fd3cf-e321-7063-95fe-f0fdbb26598b" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_019fd3cf-e321-7d10-8bbe-78ba2842e508" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_019fd3cf-e321-7714-aae1-7aa812078a5d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019fd3cf-e321-7063-95fe-f0fdbb26598b" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_019fd3cf-e321-7714-aae1-7aa812078a5d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_019fd3cf-e321-7ea2-8e46-b326e84ce4b3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019fd3cf-e321-7063-95fe-f0fdbb26598b" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_019fd3cf-e321-7ea2-8e46-b326e84ce4b3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019fd3cf-e321-700e-ac1c-f5cb126ce531" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Goodwill"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019fd3cf-e321-7063-95fe-f0fdbb26598b" xlink:to="loc_us-gaap_Goodwill_019fd3cf-e321-700e-ac1c-f5cb126ce531" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_019fd3cf-e321-706a-80c5-81c371275684" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019fd3cf-e321-7d35-925f-3f93dc91df08" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_019fd3cf-e321-706a-80c5-81c371275684" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019fd3cf-e321-7d35-925f-3f93dc91df08" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketableSecuritiesCurrent_019fd3cf-e321-7418-af65-0375fa2c1950" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MarketableSecuritiesCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_019fd3cf-e321-706a-80c5-81c371275684" xlink:to="loc_us-gaap_MarketableSecuritiesCurrent_019fd3cf-e321-7418-af65-0375fa2c1950" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_019fd3cf-e321-7986-9381-fc723eb74b11" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_019fd3cf-e321-706a-80c5-81c371275684" xlink:to="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_019fd3cf-e321-7986-9381-fc723eb74b11" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_019fd3cf-e321-7005-856f-ba9aac137ad6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsReceivableNetCurrent"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_019fd3cf-e321-706a-80c5-81c371275684" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_019fd3cf-e321-7005-856f-ba9aac137ad6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_019fd3cf-e321-78ca-8fa9-9443d2bae70c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Liabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_019fd3cf-e321-7042-8e90-4c83de370026" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_019fd3cf-e321-78ca-8fa9-9443d2bae70c" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_019fd3cf-e321-7042-8e90-4c83de370026" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_019fd3cf-e321-7306-acf5-cd3b435c1153" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_019fd3cf-e321-78ca-8fa9-9443d2bae70c" xlink:to="loc_us-gaap_LiabilitiesCurrent_019fd3cf-e321-7306-acf5-cd3b435c1153" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_019fd3cf-e321-7286-a785-79ad68184300" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherLiabilitiesNoncurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_019fd3cf-e321-78ca-8fa9-9443d2bae70c" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_019fd3cf-e321-7286-a785-79ad68184300" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_019fd3cf-e321-772b-84d7-c7894f9f60be" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebtNoncurrent"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_019fd3cf-e321-78ca-8fa9-9443d2bae70c" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_019fd3cf-e321-772b-84d7-c7894f9f60be" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_019fd3cf-e321-7364-9385-581ae18fa328" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrent_019fd3cf-e321-778a-9355-2743f92b519c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsPayableCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_019fd3cf-e321-7364-9385-581ae18fa328" xlink:to="loc_us-gaap_AccountsPayableCurrent_019fd3cf-e321-778a-9355-2743f92b519c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_019fd3cf-e321-7c37-ac61-204c8f165a28" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccruedLiabilitiesCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_019fd3cf-e321-7364-9385-581ae18fa328" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrent_019fd3cf-e321-7c37-ac61-204c8f165a28" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtCurrent_019fd3cf-e321-74a8-b364-f0c20246e692" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebtCurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_019fd3cf-e321-7364-9385-581ae18fa328" xlink:to="loc_us-gaap_LongTermDebtCurrent_019fd3cf-e321-74a8-b364-f0c20246e692" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_019fd3cf-e321-7a70-b37f-3c0cb6181274" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseLiabilityCurrent"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_019fd3cf-e321-7364-9385-581ae18fa328" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrent_019fd3cf-e321-7a70-b37f-3c0cb6181274" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCurrent_019fd3cf-e321-754a-8f5b-592cfe5fc273" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerLiabilityCurrent"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_019fd3cf-e321-7364-9385-581ae18fa328" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityCurrent_019fd3cf-e321-754a-8f5b-592cfe5fc273" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesCurrent_019fd3cf-e321-7cbb-81b9-ad66a1c2bf26" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherLiabilitiesCurrent"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_019fd3cf-e321-7364-9385-581ae18fa328" xlink:to="loc_us-gaap_OtherLiabilitiesCurrent_019fd3cf-e321-7cbb-81b9-ad66a1c2bf26" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_019fd3cf-e321-79a9-b26d-b930680dc069" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_019fd3cf-e321-736b-b040-180f6be9759e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Liabilities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_019fd3cf-e321-79a9-b26d-b930680dc069" xlink:to="loc_us-gaap_Liabilities_019fd3cf-e321-736b-b040-180f6be9759e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingencies_019fd3cf-e321-7cda-a192-6c933216b3bd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommitmentsAndContingencies"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_019fd3cf-e321-79a9-b26d-b930680dc069" xlink:to="loc_us-gaap_CommitmentsAndContingencies_019fd3cf-e321-7cda-a192-6c933216b3bd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019fd3cf-e321-77c9-a7ef-8814b67b0115" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_019fd3cf-e321-79a9-b26d-b930680dc069" xlink:to="loc_us-gaap_StockholdersEquity_019fd3cf-e321-77c9-a7ef-8814b67b0115" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://fastly.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFOPERATIONS" xlink:type="simple" xlink:href="fsly-20260930.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFOPERATIONS"/>
  <link:calculationLink xlink:role="http://fastly.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFOPERATIONS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019fd3cf-e321-7a4d-8afb-62b7e7ac628b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019fd3cf-e321-7b5e-8754-1ad90bfe6ddc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_019fd3cf-e321-7a4d-8afb-62b7e7ac628b" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019fd3cf-e321-7b5e-8754-1ad90bfe6ddc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_019fd3cf-e321-79ec-994e-6a0a12beef02" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_019fd3cf-e321-7a4d-8afb-62b7e7ac628b" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_019fd3cf-e321-79ec-994e-6a0a12beef02" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_019fd3cf-e321-7fe0-a929-b6cbfbe6afd4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_019fd3cf-e321-76d9-ae88-06f4c4cb9089" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GrossProfit"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_019fd3cf-e321-7fe0-a929-b6cbfbe6afd4" xlink:to="loc_us-gaap_GrossProfit_019fd3cf-e321-76d9-ae88-06f4c4cb9089" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpenses_019fd3cf-e321-7bdb-8a5b-96036607ee5e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingExpenses"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_019fd3cf-e321-7fe0-a929-b6cbfbe6afd4" xlink:to="loc_us-gaap_OperatingExpenses_019fd3cf-e321-7bdb-8a5b-96036607ee5e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpenses_019fd3cf-e321-714c-8b55-c5fc7deaa1ea" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingExpenses"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpense_019fd3cf-e321-733f-a4a3-b5895be8de5a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ResearchAndDevelopmentExpense"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingExpenses_019fd3cf-e321-714c-8b55-c5fc7deaa1ea" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpense_019fd3cf-e321-733f-a4a3-b5895be8de5a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingAndMarketingExpense_019fd3cf-e321-736a-be98-190ea59dfb80" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SellingAndMarketingExpense"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingExpenses_019fd3cf-e321-714c-8b55-c5fc7deaa1ea" xlink:to="loc_us-gaap_SellingAndMarketingExpense_019fd3cf-e321-736a-be98-190ea59dfb80" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_fsly_AssetImpairmentChargesExcludingOperatingLeaseImpairment_019fd3cf-e321-7229-ac13-5c21f0b71103" xlink:href="fsly-20260930.xsd#fsly_AssetImpairmentChargesExcludingOperatingLeaseImpairment"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingExpenses_019fd3cf-e321-714c-8b55-c5fc7deaa1ea" xlink:to="loc_fsly_AssetImpairmentChargesExcludingOperatingLeaseImpairment_019fd3cf-e321-7229-ac13-5c21f0b71103" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_019fd3cf-e321-7e88-9b0c-8c2ef904d10a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GeneralAndAdministrativeExpense"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingExpenses_019fd3cf-e321-714c-8b55-c5fc7deaa1ea" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpense_019fd3cf-e321-7e88-9b0c-8c2ef904d10a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019fd3cf-e321-74ce-ba95-186cb682fce3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_019fd3cf-e321-79c6-9b3a-fcd05bcdf233" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019fd3cf-e321-74ce-ba95-186cb682fce3" xlink:to="loc_us-gaap_OperatingIncomeLoss_019fd3cf-e321-79c6-9b3a-fcd05bcdf233" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIncomeInterest_019fd3cf-e321-7240-98c6-b95389d3787d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIncomeInterest"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019fd3cf-e321-74ce-ba95-186cb682fce3" xlink:to="loc_us-gaap_InvestmentIncomeInterest_019fd3cf-e321-7240-98c6-b95389d3787d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseNonoperating_019fd3cf-e321-7893-888d-03bf963a621d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestExpenseNonoperating"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019fd3cf-e321-74ce-ba95-186cb682fce3" xlink:to="loc_us-gaap_InterestExpenseNonoperating_019fd3cf-e321-7893-888d-03bf963a621d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_019fd3cf-e321-7bf2-a5be-ae5373ab4611" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019fd3cf-e321-74ce-ba95-186cb682fce3" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_019fd3cf-e321-7bf2-a5be-ae5373ab4611" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_019fd3cf-e321-7415-80fd-48dec9ba76e0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GrossProfit"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_019fd3cf-e321-797b-955c-ab4097911054" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_GrossProfit_019fd3cf-e321-7415-80fd-48dec9ba76e0" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_019fd3cf-e321-797b-955c-ab4097911054" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfRevenue_019fd3cf-e321-7522-bcbc-30b51c31c04f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CostOfRevenue"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_GrossProfit_019fd3cf-e321-7415-80fd-48dec9ba76e0" xlink:to="loc_us-gaap_CostOfRevenue_019fd3cf-e321-7522-bcbc-30b51c31c04f" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://fastly.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVELOSS" xlink:type="simple" xlink:href="fsly-20260930.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVELOSS"/>
  <link:calculationLink xlink:role="http://fastly.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVELOSS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_019fd3cf-e321-78f2-8a24-240d00dd37b5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ComprehensiveIncomeNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019fd3cf-e321-7fd3-bd0a-a275e6ff565f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_019fd3cf-e321-78f2-8a24-240d00dd37b5" xlink:to="loc_us-gaap_NetIncomeLoss_019fd3cf-e321-7fd3-bd0a-a275e6ff565f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_019fd3cf-e321-7356-acb9-f601938c29ae" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_019fd3cf-e321-78f2-8a24-240d00dd37b5" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_019fd3cf-e321-7356-acb9-f601938c29ae" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_019fd3cf-e321-748c-a973-c61ec9aca176" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent_019fd3cf-e321-7001-85e6-234ddfa7d051" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_019fd3cf-e321-748c-a973-c61ec9aca176" xlink:to="loc_us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent_019fd3cf-e321-7001-85e6-234ddfa7d051" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://fastly.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" xlink:type="simple" xlink:href="fsly-20260930.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS"/>
  <link:calculationLink xlink:role="http://fastly.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019fd3cf-e3b5-7dc2-8814-24422de1b855" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfConvertibleDebt_019fd3cf-e3b5-7d25-a6e0-ecbdc6002e6a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RepaymentsOfConvertibleDebt"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019fd3cf-e3b5-7dc2-8814-24422de1b855" xlink:to="loc_us-gaap_RepaymentsOfConvertibleDebt_019fd3cf-e3b5-7d25-a6e0-ecbdc6002e6a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDebtIssuanceCosts_019fd3cf-e3b5-7606-9a28-8c331b4517c2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsOfDebtIssuanceCosts"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019fd3cf-e3b5-7dc2-8814-24422de1b855" xlink:to="loc_us-gaap_PaymentsOfDebtIssuanceCosts_019fd3cf-e3b5-7606-9a28-8c331b4517c2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeasePrincipalPayments_019fd3cf-e3b5-71b5-b52f-89c293f08b58" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinanceLeasePrincipalPayments"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019fd3cf-e3b5-7dc2-8814-24422de1b855" xlink:to="loc_us-gaap_FinanceLeasePrincipalPayments_019fd3cf-e3b5-71b5-b52f-89c293f08b58" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromStockOptionsExercised_019fd3cf-e3b5-7eed-a644-66c085d5049f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromStockOptionsExercised"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019fd3cf-e3b5-7dc2-8814-24422de1b855" xlink:to="loc_us-gaap_ProceedsFromStockOptionsExercised_019fd3cf-e3b5-7eed-a644-66c085d5049f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromStockPlans_019fd3cf-e3b5-716e-b821-0689a2a35a76" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromStockPlans"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019fd3cf-e3b5-7dc2-8814-24422de1b855" xlink:to="loc_us-gaap_ProceedsFromStockPlans_019fd3cf-e3b5-716e-b821-0689a2a35a76" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_01a01904-c96a-71a4-a268-044c70c5d7ed" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireShortTermInvestments_01a01904-c96a-73bb-b659-263d0132cede" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquireShortTermInvestments"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_01a01904-c96a-71a4-a268-044c70c5d7ed" xlink:to="loc_us-gaap_PaymentsToAcquireShortTermInvestments_01a01904-c96a-73bb-b659-263d0132cede" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt_01a01904-c96a-7eb0-a489-f5b742b84b31" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_01a01904-c96a-71a4-a268-044c70c5d7ed" xlink:to="loc_us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt_01a01904-c96a-7eb0-a489-f5b742b84b31" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities_01a01904-c96a-7412-bb3c-adf579bb375b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_01a01904-c96a-71a4-a268-044c70c5d7ed" xlink:to="loc_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities_01a01904-c96a-7412-bb3c-adf579bb375b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_01a01904-c96a-7414-9bcb-b571a4f31322" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_01a01904-c96a-71a4-a268-044c70c5d7ed" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_01a01904-c96a-7414-9bcb-b571a4f31322" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireIntangibleAssets_01a01904-c96a-7fa3-85cd-c530d4893986" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquireIntangibleAssets"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_01a01904-c96a-71a4-a268-044c70c5d7ed" xlink:to="loc_us-gaap_PaymentsToAcquireIntangibleAssets_01a01904-c96a-7fa3-85cd-c530d4893986" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_01a01904-c96a-763a-8b17-ca1322e1c85c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_01a01904-c96a-71a4-a268-044c70c5d7ed" xlink:to="loc_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_01a01904-c96a-763a-8b17-ca1322e1c85c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForSoftware_01a11a58-6936-72f3-af95-195a0cf47dda" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsForSoftware"/>
    <link:calculationArc order="7" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_01a01904-c96a-71a4-a268-044c70c5d7ed" xlink:to="loc_us-gaap_PaymentsForSoftware_01a11a58-6936-72f3-af95-195a0cf47dda" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fd3cf-e3b5-73e2-859b-2fa1e125d989" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019fd3cf-e3b5-762a-a504-d1bf386a7a61" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fd3cf-e3b5-73e2-859b-2fa1e125d989" xlink:to="loc_us-gaap_NetIncomeLoss_019fd3cf-e3b5-762a-a504-d1bf386a7a61" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationNonproduction_019fd3cf-e3b5-715d-b325-c0ff35db9023" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DepreciationNonproduction"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fd3cf-e3b5-73e2-859b-2fa1e125d989" xlink:to="loc_us-gaap_DepreciationNonproduction_019fd3cf-e3b5-715d-b325-c0ff35db9023" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_019fd3cf-e3b5-76b1-8b46-e0c5c6b2192f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fd3cf-e3b5-73e2-859b-2fa1e125d989" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_019fd3cf-e3b5-76b1-8b46-e0c5c6b2192f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense_019fd3cf-e3b5-72c6-9053-931c43cd2f0b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fd3cf-e3b5-73e2-859b-2fa1e125d989" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense_019fd3cf-e3b5-72c6-9053-931c43cd2f0b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfFinancingCostsAndDiscounts_019fd3cf-e3b5-71dc-bb56-6927151d5dc4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AmortizationOfFinancingCostsAndDiscounts"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fd3cf-e3b5-73e2-859b-2fa1e125d989" xlink:to="loc_us-gaap_AmortizationOfFinancingCostsAndDiscounts_019fd3cf-e3b5-71dc-bb56-6927151d5dc4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostAmortization_019fd3cf-e3b5-7d33-8dbb-8f528c28447d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CapitalizedContractCostAmortization"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fd3cf-e3b5-73e2-859b-2fa1e125d989" xlink:to="loc_us-gaap_CapitalizedContractCostAmortization_019fd3cf-e3b5-7d33-8dbb-8f528c28447d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_019fd3cf-e3b5-738c-bf33-fe114c36b029" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensation"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fd3cf-e3b5-73e2-859b-2fa1e125d989" xlink:to="loc_us-gaap_ShareBasedCompensation_019fd3cf-e3b5-738c-bf33-fe114c36b029" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_019fd3cf-e3b5-7288-aaf6-f12a31832dcd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fd3cf-e3b5-73e2-859b-2fa1e125d989" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_019fd3cf-e3b5-7288-aaf6-f12a31832dcd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProvisionForDoubtfulAccounts_019fd3cf-e3b5-7c30-a932-09dc91424605" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProvisionForDoubtfulAccounts"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fd3cf-e3b5-73e2-859b-2fa1e125d989" xlink:to="loc_us-gaap_ProvisionForDoubtfulAccounts_019fd3cf-e3b5-7c30-a932-09dc91424605" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfPropertyPlantEquipment_019fd3cf-e3b5-7f0c-9eb2-3683ad5446b1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainLossOnSaleOfPropertyPlantEquipment"/>
    <link:calculationArc order="10" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fd3cf-e3b5-73e2-859b-2fa1e125d989" xlink:to="loc_us-gaap_GainLossOnSaleOfPropertyPlantEquipment_019fd3cf-e3b5-7f0c-9eb2-3683ad5446b1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments_019fd3cf-e3b5-76af-9724-fbf540459638" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments"/>
    <link:calculationArc order="11" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fd3cf-e3b5-73e2-859b-2fa1e125d989" xlink:to="loc_us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments_019fd3cf-e3b5-76af-9724-fbf540459638" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_fsly_AssetImpairmentChargesExcludingOperatingLeaseImpairment_019fd3cf-e3b5-7b36-ae71-29cf392c6de6" xlink:href="fsly-20260930.xsd#fsly_AssetImpairmentChargesExcludingOperatingLeaseImpairment"/>
    <link:calculationArc order="12" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fd3cf-e3b5-73e2-859b-2fa1e125d989" xlink:to="loc_fsly_AssetImpairmentChargesExcludingOperatingLeaseImpairment_019fd3cf-e3b5-7b36-ae71-29cf392c6de6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaidInKindInterest_019fd3cf-e3b5-764d-bf28-562e95fbbaf1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaidInKindInterest"/>
    <link:calculationArc order="13" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fd3cf-e3b5-73e2-859b-2fa1e125d989" xlink:to="loc_us-gaap_PaidInKindInterest_019fd3cf-e3b5-764d-bf28-562e95fbbaf1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncashIncomeExpense_019fd3cf-e3b5-7b15-a0e6-afeab481ff6f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherNoncashIncomeExpense"/>
    <link:calculationArc order="14" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fd3cf-e3b5-73e2-859b-2fa1e125d989" xlink:to="loc_us-gaap_OtherNoncashIncomeExpense_019fd3cf-e3b5-7b15-a0e6-afeab481ff6f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_019fd3cf-e3b5-7595-8f9f-f84e58ece3d7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable"/>
    <link:calculationArc order="15" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fd3cf-e3b5-73e2-859b-2fa1e125d989" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_019fd3cf-e3b5-7595-8f9f-f84e58ece3d7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_019fd3cf-e3b5-7ca1-88b1-5975a8776806" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets"/>
    <link:calculationArc order="16" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fd3cf-e3b5-73e2-859b-2fa1e125d989" xlink:to="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_019fd3cf-e3b5-7ca1-88b1-5975a8776806" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_019fd3cf-e3b5-74c8-9a03-0eeccd069c20" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInOtherOperatingAssets"/>
    <link:calculationArc order="17" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fd3cf-e3b5-73e2-859b-2fa1e125d989" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_019fd3cf-e3b5-74c8-9a03-0eeccd069c20" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayable_019fd3cf-e3b5-7a43-afae-f297fe65d348" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInAccountsPayable"/>
    <link:calculationArc order="18" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fd3cf-e3b5-73e2-859b-2fa1e125d989" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayable_019fd3cf-e3b5-7a43-afae-f297fe65d348" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedLiabilities_019fd3cf-e3b5-7c92-9d83-6348167bfe3d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInAccruedLiabilities"/>
    <link:calculationArc order="19" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fd3cf-e3b5-73e2-859b-2fa1e125d989" xlink:to="loc_us-gaap_IncreaseDecreaseInAccruedLiabilities_019fd3cf-e3b5-7c92-9d83-6348167bfe3d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_fsly_IncreaseDecreaseInOperatingLeaseLiabilities_019fd3cf-e3b5-7b04-a0bb-57132b1283c0" xlink:href="fsly-20260930.xsd#fsly_IncreaseDecreaseInOperatingLeaseLiabilities"/>
    <link:calculationArc order="20" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fd3cf-e3b5-73e2-859b-2fa1e125d989" xlink:to="loc_fsly_IncreaseDecreaseInOperatingLeaseLiabilities_019fd3cf-e3b5-7b04-a0bb-57132b1283c0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_019fd3cf-e3b5-7a81-83d0-93e1483fc04d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInOtherOperatingLiabilities"/>
    <link:calculationArc order="21" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fd3cf-e3b5-73e2-859b-2fa1e125d989" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_019fd3cf-e3b5-7a81-83d0-93e1483fc04d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_019fd3cf-e3b5-7932-a2ad-0db5035051d0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fd3cf-e3b5-789c-a00b-8241d8a40632" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_019fd3cf-e3b5-7932-a2ad-0db5035051d0" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fd3cf-e3b5-789c-a00b-8241d8a40632" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019fd3cf-e3b5-7bdb-bcfb-50dd6e55eb7c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_019fd3cf-e3b5-7932-a2ad-0db5035051d0" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019fd3cf-e3b5-7bdb-bcfb-50dd6e55eb7c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019fd3cf-e3b5-776d-ad86-211c50d05b44" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_019fd3cf-e3b5-7932-a2ad-0db5035051d0" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019fd3cf-e3b5-776d-ad86-211c50d05b44" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019fd3cf-e3b5-77eb-bc59-72108cdd8962" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_019fd3cf-e3b5-7932-a2ad-0db5035051d0" xlink:to="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019fd3cf-e3b5-77eb-bc59-72108cdd8962" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://fastly.com/role/InvestmentsandFairValueMeasurementsDetails" xlink:type="simple" xlink:href="fsly-20260930.xsd#InvestmentsandFairValueMeasurementsDetails"/>
  <link:calculationLink xlink:role="http://fastly.com/role/InvestmentsandFairValueMeasurementsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_fsly_CashAndCashEquivalentAndDebtSecuritiesAvailableForSaleAmortizedCost_019fd3cf-e3b5-77e2-9976-4285945d5ce2" xlink:href="fsly-20260930.xsd#fsly_CashAndCashEquivalentAndDebtSecuritiesAvailableForSaleAmortizedCost"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_019fd3cf-e3b5-73a4-b2a2-2e9243cf2399" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_fsly_CashAndCashEquivalentAndDebtSecuritiesAvailableForSaleAmortizedCost_019fd3cf-e3b5-77e2-9976-4285945d5ce2" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_019fd3cf-e3b5-73a4-b2a2-2e9243cf2399" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_019fd3cf-e3b5-7071-989c-18c2c15d4f00" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_fsly_CashAndCashEquivalentAndDebtSecuritiesAvailableForSaleAmortizedCost_019fd3cf-e3b5-77e2-9976-4285945d5ce2" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_019fd3cf-e3b5-7071-989c-18c2c15d4f00" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_fsly_CashAndCashEquivalentAndDebtSecuritiesAvailableForSaleFairValue_019fd3cf-e3b5-7d7b-8d22-74e534d743da" xlink:href="fsly-20260930.xsd#fsly_CashAndCashEquivalentAndDebtSecuritiesAvailableForSaleFairValue"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_fsly_CashAndCashEquivalentAndDebtSecuritiesAvailableForSaleAmortizedCost_019fd3cf-e3b5-77e2-9976-4285945d5ce2" xlink:to="loc_fsly_CashAndCashEquivalentAndDebtSecuritiesAvailableForSaleFairValue_019fd3cf-e3b5-7d7b-8d22-74e534d743da" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_fsly_CashAndCashEquivalentAndDebtSecuritiesAvailableForSaleFairValue_019fd3cf-e3b5-7695-b792-4ddf8761cd4b" xlink:href="fsly-20260930.xsd#fsly_CashAndCashEquivalentAndDebtSecuritiesAvailableForSaleFairValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_019fd3cf-e3b5-79f1-a850-c35e685f75c3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndCashEquivalentsFairValueDisclosure"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_fsly_CashAndCashEquivalentAndDebtSecuritiesAvailableForSaleFairValue_019fd3cf-e3b5-7695-b792-4ddf8761cd4b" xlink:to="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_019fd3cf-e3b5-79f1-a850-c35e685f75c3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_019fd3cf-e3b5-7a70-890e-dd31cc456ca4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_fsly_CashAndCashEquivalentAndDebtSecuritiesAvailableForSaleFairValue_019fd3cf-e3b5-7695-b792-4ddf8761cd4b" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_019fd3cf-e3b5-7a70-890e-dd31cc456ca4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_019fd3cf-e3b5-7497-96b1-e7a5a0588da4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_019fd3cf-e3b5-7f6d-8e7c-4f909a8e5a5c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_019fd3cf-e3b5-7497-96b1-e7a5a0588da4" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_019fd3cf-e3b5-7f6d-8e7c-4f909a8e5a5c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_019fd3cf-e3b5-79d8-b981-dd664e2dac6e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_019fd3cf-e3b5-7497-96b1-e7a5a0588da4" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_019fd3cf-e3b5-79d8-b981-dd664e2dac6e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_019fd3cf-e3b5-7df8-93c5-76ff1e963c17" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_019fd3cf-e3b5-7497-96b1-e7a5a0588da4" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_019fd3cf-e3b5-7df8-93c5-76ff1e963c17" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019fd3cf-e3b5-7ec5-95dd-4fedb163704c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_019fd3cf-e3b5-70ea-8be0-8ecebd9c361a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndCashEquivalentsFairValueDisclosure"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019fd3cf-e3b5-7ec5-95dd-4fedb163704c" xlink:to="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_019fd3cf-e3b5-70ea-8be0-8ecebd9c361a" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://fastly.com/role/InvestmentsandFairValueMeasurementsDetails_1" xlink:type="simple" xlink:href="fsly-20260930.xsd#InvestmentsandFairValueMeasurementsDetails_1"/>
  <link:calculationLink xlink:role="http://fastly.com/role/InvestmentsandFairValueMeasurementsDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_fsly_CashAndCashEquivalentAndDebtSecuritiesAvailableForSaleAmortizedCost_019fd3cf-e3b5-71d8-aadf-1e41d726c763" xlink:href="fsly-20260930.xsd#fsly_CashAndCashEquivalentAndDebtSecuritiesAvailableForSaleAmortizedCost"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019fd3cf-e3b5-7c70-b6b2-97bbdf31ed08" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_fsly_CashAndCashEquivalentAndDebtSecuritiesAvailableForSaleAmortizedCost_019fd3cf-e3b5-71d8-aadf-1e41d726c763" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019fd3cf-e3b5-7c70-b6b2-97bbdf31ed08" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_019fd3cf-e3b5-7a8c-8f18-17ccf8a2f378" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_fsly_CashAndCashEquivalentAndDebtSecuritiesAvailableForSaleAmortizedCost_019fd3cf-e3b5-71d8-aadf-1e41d726c763" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_019fd3cf-e3b5-7a8c-8f18-17ccf8a2f378" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://fastly.com/role/BalanceSheetInformationScheduleofPropertyandEquipmentNetDetails" xlink:type="simple" xlink:href="fsly-20260930.xsd#BalanceSheetInformationScheduleofPropertyandEquipmentNetDetails"/>
  <link:calculationLink xlink:role="http://fastly.com/role/BalanceSheetInformationScheduleofPropertyandEquipmentNetDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_019fd3cf-e3b5-7046-82b5-4b49eb430ed8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization_019fd3cf-e3b5-7f27-a11d-84e4c1732c08" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_019fd3cf-e3b5-7046-82b5-4b49eb430ed8" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization_019fd3cf-e3b5-7f27-a11d-84e4c1732c08" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_019fd3cf-e3b5-7cc9-8502-428530c5b1a5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_019fd3cf-e3b5-7046-82b5-4b49eb430ed8" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_019fd3cf-e3b5-7cc9-8502-428530c5b1a5" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://fastly.com/role/BalanceSheetInformationScheduleofOtherAssetsDetails" xlink:type="simple" xlink:href="fsly-20260930.xsd#BalanceSheetInformationScheduleofOtherAssetsDetails"/>
  <link:calculationLink xlink:role="http://fastly.com/role/BalanceSheetInformationScheduleofOtherAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_019fd3cf-e3b5-7391-9696-c32ea17922e0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherAssetsNoncurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsMiscellaneousNoncurrent_019fd3cf-e3b5-7125-bebb-958f03fdc211" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherAssetsMiscellaneousNoncurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAssetsNoncurrent_019fd3cf-e3b5-7391-9696-c32ea17922e0" xlink:to="loc_us-gaap_OtherAssetsMiscellaneousNoncurrent_019fd3cf-e3b5-7125-bebb-958f03fdc211" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostNetNoncurrent_019fd3cf-e3b5-7bb9-8d08-918f16708b7d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CapitalizedContractCostNetNoncurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAssetsNoncurrent_019fd3cf-e3b5-7391-9696-c32ea17922e0" xlink:to="loc_us-gaap_CapitalizedContractCostNetNoncurrent_019fd3cf-e3b5-7bb9-8d08-918f16708b7d" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://fastly.com/role/BalanceSheetInformationScheduleofAccruedExpensesDetails" xlink:type="simple" xlink:href="fsly-20260930.xsd#BalanceSheetInformationScheduleofAccruedExpensesDetails"/>
  <link:calculationLink xlink:role="http://fastly.com/role/BalanceSheetInformationScheduleofAccruedExpensesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_019fd3cf-e3b5-761f-95ca-6ec436733309" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccruedLiabilitiesCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent_019fd3cf-e3b5-7e64-a699-5b5af4384688" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_019fd3cf-e3b5-761f-95ca-6ec436733309" xlink:to="loc_us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent_019fd3cf-e3b5-7e64-a699-5b5af4384688" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_019fd3cf-e3b5-7b8c-a536-80ffff5c04d4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmployeeRelatedLiabilitiesCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_019fd3cf-e3b5-761f-95ca-6ec436733309" xlink:to="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_019fd3cf-e3b5-7b8c-a536-80ffff5c04d4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_fsly_AccruedColocationAndBandwidthCosts_019fd3cf-e3b5-7936-b97b-f17b6ff504c7" xlink:href="fsly-20260930.xsd#fsly_AccruedColocationAndBandwidthCosts"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_019fd3cf-e3b5-761f-95ca-6ec436733309" xlink:to="loc_fsly_AccruedColocationAndBandwidthCosts_019fd3cf-e3b5-7936-b97b-f17b6ff504c7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAccruedLiabilitiesCurrent_019fd3cf-e3b5-7261-adc5-5bd36fe92ce8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherAccruedLiabilitiesCurrent"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_019fd3cf-e3b5-761f-95ca-6ec436733309" xlink:to="loc_us-gaap_OtherAccruedLiabilitiesCurrent_019fd3cf-e3b5-7261-adc5-5bd36fe92ce8" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://fastly.com/role/LeasesScheduleofComponentsofOperatingLeaseCostDetails" xlink:type="simple" xlink:href="fsly-20260930.xsd#LeasesScheduleofComponentsofOperatingLeaseCostDetails"/>
  <link:calculationLink xlink:role="http://fastly.com/role/LeasesScheduleofComponentsofOperatingLeaseCostDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_fsly_OperatingVariableAndShortTermLeaseCosts_019fd3cf-e3b5-70bb-809e-aeb2a8dd2777" xlink:href="fsly-20260930.xsd#fsly_OperatingVariableAndShortTermLeaseCosts"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseCost_019fd3cf-e3b5-782c-b04c-e44b9edc844d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseCost"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_fsly_OperatingVariableAndShortTermLeaseCosts_019fd3cf-e3b5-70bb-809e-aeb2a8dd2777" xlink:to="loc_us-gaap_OperatingLeaseCost_019fd3cf-e3b5-782c-b04c-e44b9edc844d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableLeaseCost_019fd3cf-e3b5-75cb-b516-87fdf1569e82" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableLeaseCost"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_fsly_OperatingVariableAndShortTermLeaseCosts_019fd3cf-e3b5-70bb-809e-aeb2a8dd2777" xlink:to="loc_us-gaap_VariableLeaseCost_019fd3cf-e3b5-75cb-b516-87fdf1569e82" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://fastly.com/role/LeasesScheduleofOperatingLeaseMaturityDetails" xlink:type="simple" xlink:href="fsly-20260930.xsd#LeasesScheduleofOperatingLeaseMaturityDetails"/>
  <link:calculationLink xlink:role="http://fastly.com/role/LeasesScheduleofOperatingLeaseMaturityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_019fd3cf-e3b5-7120-aad8-9fcdf8ebe3fa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_019fd3cf-e3b5-737b-823b-e2d16daccd27" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_019fd3cf-e3b5-7120-aad8-9fcdf8ebe3fa" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_019fd3cf-e3b5-737b-823b-e2d16daccd27" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_019fd3cf-e3b5-7eda-a2c1-fbe0b059155b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_019fd3cf-e3b5-7120-aad8-9fcdf8ebe3fa" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_019fd3cf-e3b5-7eda-a2c1-fbe0b059155b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_019fd3cf-e3b5-752a-8fbf-cade1e69aae0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_019fd3cf-e3b5-7120-aad8-9fcdf8ebe3fa" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_019fd3cf-e3b5-752a-8fbf-cade1e69aae0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_019fd3cf-e3b5-7d69-aa30-4096eb1a7d1f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_019fd3cf-e3b5-7120-aad8-9fcdf8ebe3fa" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_019fd3cf-e3b5-7d69-aa30-4096eb1a7d1f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_019fd3cf-e3b5-7907-9800-44d2096cabb9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_019fd3cf-e3b5-7120-aad8-9fcdf8ebe3fa" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_019fd3cf-e3b5-7907-9800-44d2096cabb9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_fsly_LesseeOperatingLeaseLiabilityToBePaidAfterYearFour_019fd3cf-e3b5-7843-a318-73339df606d0" xlink:href="fsly-20260930.xsd#fsly_LesseeOperatingLeaseLiabilityToBePaidAfterYearFour"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_019fd3cf-e3b5-7120-aad8-9fcdf8ebe3fa" xlink:to="loc_fsly_LesseeOperatingLeaseLiabilityToBePaidAfterYearFour_019fd3cf-e3b5-7843-a318-73339df606d0" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://fastly.com/role/LeasesScheduleofOperatingLeaseMaturityDetails_1" xlink:type="simple" xlink:href="fsly-20260930.xsd#LeasesScheduleofOperatingLeaseMaturityDetails_1"/>
  <link:calculationLink xlink:role="http://fastly.com/role/LeasesScheduleofOperatingLeaseMaturityDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_019fd3cf-e3b5-731a-a96f-c30ddf6cd11a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_019fd3cf-e3b5-7680-bdd6-f821578e3654" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_019fd3cf-e3b5-731a-a96f-c30ddf6cd11a" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_019fd3cf-e3b5-7680-bdd6-f821578e3654" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_019fd3cf-e3b5-7f39-8de0-73e45651126b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_019fd3cf-e3b5-731a-a96f-c30ddf6cd11a" xlink:to="loc_us-gaap_OperatingLeaseLiability_019fd3cf-e3b5-7f39-8de0-73e45651126b" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://fastly.com/role/GoodwillandIntangibleAssetsScheduleofIntangibleAssetsDetails" xlink:type="simple" xlink:href="fsly-20260930.xsd#GoodwillandIntangibleAssetsScheduleofIntangibleAssetsDetails"/>
  <link:calculationLink xlink:role="http://fastly.com/role/GoodwillandIntangibleAssetsScheduleofIntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019fd3cf-e3b5-7670-aa45-790f10d8f104" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_019fd3cf-e3b5-789d-8d7b-0feb3f184572" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019fd3cf-e3b5-7670-aa45-790f10d8f104" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_019fd3cf-e3b5-789d-8d7b-0feb3f184572" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_019fd3cf-e3b5-7406-9061-6317633110fa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019fd3cf-e3b5-7670-aa45-790f10d8f104" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_019fd3cf-e3b5-7406-9061-6317633110fa" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://fastly.com/role/GoodwillandIntangibleAssetsScheduleofExpectedAmortizationExpenseofIntangibleAssetsDetails" xlink:type="simple" xlink:href="fsly-20260930.xsd#GoodwillandIntangibleAssetsScheduleofExpectedAmortizationExpenseofIntangibleAssetsDetails"/>
  <link:calculationLink xlink:role="http://fastly.com/role/GoodwillandIntangibleAssetsScheduleofExpectedAmortizationExpenseofIntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019fd3cf-e3b5-7cdc-a2fc-44f3c3969d12" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear_019fd3cf-e3b5-7678-a495-4f33aa7fc0aa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019fd3cf-e3b5-7cdc-a2fc-44f3c3969d12" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear_019fd3cf-e3b5-7678-a495-4f33aa7fc0aa" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_019fd3cf-e3b5-710a-a60c-73bb64bc4b7a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019fd3cf-e3b5-7cdc-a2fc-44f3c3969d12" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_019fd3cf-e3b5-710a-a60c-73bb64bc4b7a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_019fd3cf-e3b5-730f-802f-19f5198dbb07" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019fd3cf-e3b5-7cdc-a2fc-44f3c3969d12" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_019fd3cf-e3b5-730f-802f-19f5198dbb07" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_019fd3cf-e3b5-7c5a-b8a2-c1e055d03a88" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019fd3cf-e3b5-7cdc-a2fc-44f3c3969d12" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_019fd3cf-e3b5-7c5a-b8a2-c1e055d03a88" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_019fd3cf-e3b5-7248-91f5-7f9396265a97" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019fd3cf-e3b5-7cdc-a2fc-44f3c3969d12" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_019fd3cf-e3b5-7248-91f5-7f9396265a97" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_fsly_IntangibleAssetFiniteLivedEstimatedAmortizationExpenseAfterYearFour_019fd3cf-e3b5-7daa-995b-ae6042aacf9c" xlink:href="fsly-20260930.xsd#fsly_IntangibleAssetFiniteLivedEstimatedAmortizationExpenseAfterYearFour"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019fd3cf-e3b5-7cdc-a2fc-44f3c3969d12" xlink:to="loc_fsly_IntangibleAssetFiniteLivedEstimatedAmortizationExpenseAfterYearFour_019fd3cf-e3b5-7daa-995b-ae6042aacf9c" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://fastly.com/role/DebtInstrumentsScheduleofCarryingValueofNotesDetails" xlink:type="simple" xlink:href="fsly-20260930.xsd#DebtInstrumentsScheduleofCarryingValueofNotesDetails"/>
  <link:calculationLink xlink:role="http://fastly.com/role/DebtInstrumentsScheduleofCarryingValueofNotesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_019fd3cf-e3b5-7d1d-8c6e-6c75f8107327" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebt"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_019fd3cf-e3b5-787d-94aa-2c4cb59910ea" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebt_019fd3cf-e3b5-7d1d-8c6e-6c75f8107327" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_019fd3cf-e3b5-787d-94aa-2c4cb59910ea" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_019fd3cf-e3b5-7018-9a1e-7b719bc412ee" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebt_019fd3cf-e3b5-7d1d-8c6e-6c75f8107327" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_019fd3cf-e3b5-7018-9a1e-7b719bc412ee" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://fastly.com/role/CommitmentsandContingenciesDetails" xlink:type="simple" xlink:href="fsly-20260930.xsd#CommitmentsandContingenciesDetails"/>
  <link:calculationLink xlink:role="http://fastly.com/role/CommitmentsandContingenciesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PurchaseObligation_019fd3cf-e3b5-7afb-9d5b-6bc8617986a2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PurchaseObligation"/>
    <link:loc xlink:type="locator" xlink:label="loc_fsly_PurchaseObligationToBePaidAfterYearFour_019fd3cf-e3b5-7776-a5a1-18bdb0d2c259" xlink:href="fsly-20260930.xsd#fsly_PurchaseObligationToBePaidAfterYearFour"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_PurchaseObligation_019fd3cf-e3b5-7afb-9d5b-6bc8617986a2" xlink:to="loc_fsly_PurchaseObligationToBePaidAfterYearFour_019fd3cf-e3b5-7776-a5a1-18bdb0d2c259" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PurchaseObligationDueInFourthYear_019fd3cf-e3b5-74b4-a1b3-806d464c9bdf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PurchaseObligationDueInFourthYear"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_PurchaseObligation_019fd3cf-e3b5-7afb-9d5b-6bc8617986a2" xlink:to="loc_us-gaap_PurchaseObligationDueInFourthYear_019fd3cf-e3b5-74b4-a1b3-806d464c9bdf" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PurchaseObligationFutureMinimumPaymentsRemainderOfFiscalYear_019fd3cf-e3b5-7541-ba88-3df308bccb9e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PurchaseObligationFutureMinimumPaymentsRemainderOfFiscalYear"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_PurchaseObligation_019fd3cf-e3b5-7afb-9d5b-6bc8617986a2" xlink:to="loc_us-gaap_PurchaseObligationFutureMinimumPaymentsRemainderOfFiscalYear_019fd3cf-e3b5-7541-ba88-3df308bccb9e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PurchaseObligationDueInThirdYear_019fd3cf-e3b5-729a-807f-05b2ecffea41" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PurchaseObligationDueInThirdYear"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_PurchaseObligation_019fd3cf-e3b5-7afb-9d5b-6bc8617986a2" xlink:to="loc_us-gaap_PurchaseObligationDueInThirdYear_019fd3cf-e3b5-729a-807f-05b2ecffea41" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PurchaseObligationDueInSecondYear_019fd3cf-e3b5-79da-b5bf-db6274598439" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PurchaseObligationDueInSecondYear"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_PurchaseObligation_019fd3cf-e3b5-7afb-9d5b-6bc8617986a2" xlink:to="loc_us-gaap_PurchaseObligationDueInSecondYear_019fd3cf-e3b5-79da-b5bf-db6274598439" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PurchaseObligationDueInNextTwelveMonths_019fd3cf-e3b5-7fda-89d6-b20959b41abc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PurchaseObligationDueInNextTwelveMonths"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_PurchaseObligation_019fd3cf-e3b5-7afb-9d5b-6bc8617986a2" xlink:to="loc_us-gaap_PurchaseObligationDueInNextTwelveMonths_019fd3cf-e3b5-7fda-89d6-b20959b41abc" xlink:type="arc"/>
  </link:calculationLink>
</link:linkbase>
