diff --git a/tools/gulp/tasks/payload.ts b/tools/gulp/tasks/payload.ts
index 7c002324574..70fd6996206 100644
--- a/tools/gulp/tasks/payload.ts
+++ b/tools/gulp/tasks/payload.ts
@@ -93,10 +93,10 @@ async function calculatePayloadDiff(database: firebaseAdmin.database.Database, c
 
   // Calculate the payload diffs by subtracting the previous size of the FESM ES2015 bundles.
   const cdkFullSize = currentPayload.cdk_fesm_2015;
-  const cdkDiff = cdkFullSize - previousPayload.cdk_fesm_2015;
+  const cdkDiff = roundFileSize(cdkFullSize - previousPayload.cdk_fesm_2015);
 
   const materialFullSize = currentPayload.material_fesm_2015;
-  const materialDiff = materialFullSize - previousPayload.material_fesm_2015;
+  const materialDiff = roundFileSize(materialFullSize - previousPayload.material_fesm_2015);
 
   // Set the Github statuses for the packages by sending a HTTP request to the dashboard functions.
   await Promise.all([
@@ -174,3 +174,8 @@ function getCommitFromPreviousPayloadUpload(): string {
     return spawnSync('git', ['rev-parse', process.env['TRAVIS_BRANCH']]).stdout.toString().trim();
   }
 }
+
+/** Rounds the specified file size to two decimal places. */
+function roundFileSize(fileSize: number) {
+  return Math.round(fileSize * 100) / 100;
+}