diff --git a/core/src/main/resources/org/apache/spark/ui/static/utils.js b/core/src/main/resources/org/apache/spark/ui/static/utils.js
index edc0ee2ce181..110a3c4bf419 100644
--- a/core/src/main/resources/org/apache/spark/ui/static/utils.js
+++ b/core/src/main/resources/org/apache/spark/ui/static/utils.js
@@ -40,7 +40,7 @@ function formatDuration(milliseconds) {
 function formatBytes(bytes, type) {
     if (type !== 'display') return bytes;
     if (bytes == 0) return '0.0 B';
-    var k = 1000;
+    var k = 1024;
     var dm = 1;
     var sizes = ['B', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'];
     var i = Math.floor(Math.log(bytes) / Math.log(k));