diff --git a/app/components/Index/common/constants.ts b/app/components/Index/common/constants.ts
index bd12237b4..cd97a04d4 100644
--- a/app/components/Index/common/constants.ts
+++ b/app/components/Index/common/constants.ts
@@ -5,6 +5,8 @@ import {
   calculateSummaryTotalCellCount,
   getSummaryCount,
 } from "./utils";
+import { formatCountSize } from "@databiosphere/findable-ui/lib/utils/formatCountSize";
+import { formatFileSize } from "@databiosphere/findable-ui/lib/utils/formatFileSize";
 
 // Template constants
 const {
@@ -53,24 +55,29 @@ const {
   FILES,
   SPECIES,
   SPECIMENS,
+  TOTAL_FILE_SIZE,
 } = SUMMARY;
 
 /**
  * Functions binding summary response API to summary count.
  */
 export const BIND_SUMMARY_RESPONSE = {
-  [BIOSAMPLES]: (r: AzulSummaryResponse): number =>
-    getSummaryCount(r, SUMMARY_KEY.BIOSAMPLES),
-  [DONORS]: (r: AzulSummaryResponse): number =>
-    getSummaryCount(r, SUMMARY_KEY.DONORS),
-  [ESTIMATED_CELLS]: calculateSummaryTotalCellCount,
-  [FILES]: (r: AzulSummaryResponse): number =>
-    getSummaryCount(r, SUMMARY_KEY.FILES),
-  [FILE_FORMATS]: calculateSummaryFileFormatsCount,
-  [SPECIES]: (r: AzulSummaryResponse): number =>
-    getSummaryCount(r, SUMMARY_KEY.SPECIES),
-  [SPECIMENS]: (r: AzulSummaryResponse): number =>
-    getSummaryCount(r, SUMMARY_KEY.SPECIMENS),
+  [BIOSAMPLES]: (r: AzulSummaryResponse): string =>
+    formatCountSize(getSummaryCount(r, SUMMARY_KEY.BIOSAMPLES)),
+  [DONORS]: (r: AzulSummaryResponse): string =>
+    formatCountSize(getSummaryCount(r, SUMMARY_KEY.DONORS)),
+  [ESTIMATED_CELLS]: (r: AzulSummaryResponse): string =>
+    formatCountSize(calculateSummaryTotalCellCount(r)),
+  [FILES]: (r: AzulSummaryResponse): string =>
+    formatCountSize(getSummaryCount(r, SUMMARY_KEY.FILES)),
+  [FILE_FORMATS]: (r: AzulSummaryResponse): string =>
+    formatCountSize(calculateSummaryFileFormatsCount(r)),
+  [SPECIES]: (r: AzulSummaryResponse): string =>
+    formatCountSize(getSummaryCount(r, SUMMARY_KEY.SPECIES)),
+  [SPECIMENS]: (r: AzulSummaryResponse): string =>
+    formatCountSize(getSummaryCount(r, SUMMARY_KEY.SPECIMENS)),
+  [TOTAL_FILE_SIZE]: (r: AzulSummaryResponse): string =>
+    formatFileSize(getSummaryCount(r, SUMMARY_KEY.TOTAL_FILE_SIZE)),
 };
 
 export const NETWORK_KEYS = [
@@ -162,13 +169,14 @@ export const PLURALIZED_METADATA_LABEL = {
 /**
  * Set of possible summary keys.
  */
-export const SUMMARY_KEY = {
+export const SUMMARY_KEY: Record<string, keyof AzulSummaryResponse> = {
   [BIOSAMPLES]: "biosampleCount",
   [DONORS]: "donorCount",
   [FILES]: "fileCount",
   [FILE_FORMATS]: "fileFormats",
   [SPECIES]: "speciesCount",
   [SPECIMENS]: "specimenCount",
+  [TOTAL_FILE_SIZE]: "totalFileSize",
 } as const;
 
 /**
@@ -182,4 +190,5 @@ export const SUMMARY_LABEL = {
   [FILE_FORMATS]: "Files",
   [SPECIES]: "Species",
   [SPECIMENS]: "Specimens",
+  [TOTAL_FILE_SIZE]: "",
 };
diff --git a/app/components/Index/common/entities.ts b/app/components/Index/common/entities.ts
index 86cd800da..0989a4e28 100644
--- a/app/components/Index/common/entities.ts
+++ b/app/components/Index/common/entities.ts
@@ -56,4 +56,5 @@ export enum SUMMARY {
   FILES = "FILES",
   SPECIES = "SPECIES",
   SPECIMENS = "SPECIMENS",
+  TOTAL_FILE_SIZE = "TOTAL_FILE_SIZE",
 }
diff --git a/app/components/Index/common/indexTransformer.ts b/app/components/Index/common/indexTransformer.ts
index eadda09b0..cf3051524 100644
--- a/app/components/Index/common/indexTransformer.ts
+++ b/app/components/Index/common/indexTransformer.ts
@@ -1,5 +1,4 @@
 import { AzulSummaryResponse } from "@databiosphere/findable-ui/lib/apis/azul/common/entities";
-import { formatCountSize } from "@databiosphere/findable-ui/lib/utils/formatCountSize";
 import {
   BIND_SUMMARY_RESPONSE,
   PLURALIZED_METADATA_LABEL,
@@ -30,7 +29,7 @@ export function mapSummary(
 ): [string, string][] {
   return summaries.map((summary) => {
     const summaryBinderFn = BIND_SUMMARY_RESPONSE[summary];
-    const count = formatCountSize(summaryBinderFn(summaryResponse));
+    const count = summaryBinderFn(summaryResponse);
     const label = SUMMARY_LABEL[summary];
     return [count, label];
   });
diff --git a/e2e/anvil/anvil-index-export-button.spec.ts b/e2e/anvil/anvil-index-export-button.spec.ts
index fa70eba4f..fff62898c 100644
--- a/e2e/anvil/anvil-index-export-button.spec.ts
+++ b/e2e/anvil/anvil-index-export-button.spec.ts
@@ -60,6 +60,8 @@ test.describe("AnVIL Data Explorer Export", () => {
     // Test that each summary item is present in the export summary
     // with corresponding count.
     for (const [label, count] of summary) {
+      // Total file size summary item has no label.
+      if (!label) continue;
       const summaryItem = exportSummaryLocator
         .locator("> div")
         .filter({ hasText: label });
diff --git a/site-config/anvil-cmg/dev/index/common/constants.ts b/site-config/anvil-cmg/dev/index/common/constants.ts
index 8f44257fb..38a086cfa 100644
--- a/site-config/anvil-cmg/dev/index/common/constants.ts
+++ b/site-config/anvil-cmg/dev/index/common/constants.ts
@@ -1,9 +1,9 @@
 import { SUMMARY } from "app/components/Index/common/entities";
 
 // Template constants
-const { BIOSAMPLES, DONORS, FILE_FORMATS } = SUMMARY;
+const { BIOSAMPLES, DONORS, FILE_FORMATS, TOTAL_FILE_SIZE } = SUMMARY;
 
 /**
  * Summary display order.
  */
-export const SUMMARIES = [BIOSAMPLES, DONORS, FILE_FORMATS];
+export const SUMMARIES = [BIOSAMPLES, DONORS, FILE_FORMATS, TOTAL_FILE_SIZE];