diff --git a/packages/rolldown/src/app/components/display/FileSizeBadge.vue b/packages/rolldown/src/app/components/display/FileSizeBadge.vue
index 14f10558..cc0c185c 100644
--- a/packages/rolldown/src/app/components/display/FileSizeBadge.vue
+++ b/packages/rolldown/src/app/components/display/FileSizeBadge.vue
@@ -20,7 +20,7 @@ const props = withDefaults(
   },
 )
 
-const KB = 1024
+const KB = 1000
 const MB = KB ** 2
 
 const colorScale = [
diff --git a/packages/rolldown/src/app/utils/__tests__/format.test.ts b/packages/rolldown/src/app/utils/__tests__/format.test.ts
index 61e1dc91..2b8333ad 100644
--- a/packages/rolldown/src/app/utils/__tests__/format.test.ts
+++ b/packages/rolldown/src/app/utils/__tests__/format.test.ts
@@ -3,20 +3,20 @@ import { describe, expect, it } from 'vitest'
 import { bytesToHumanSize, getContentByteSize, toTree } from '../format'
 
 describe('bytesToHumanSize', () => {
-  it('should return raw bytes (<1024)', () => {
+  it('should return raw bytes (<1000)', () => {
     expect(bytesToHumanSize(10)).toEqual([10, 'B'])
   })
 
   it('should return kb with proper digits', () => {
-    expect(bytesToHumanSize(1024)).toEqual(['1', 'KB'])
-    expect(bytesToHumanSize(1024 * 1.5)).toEqual(['1.5', 'KB'])
-    expect(bytesToHumanSize(1024 * 1.666, 1)).toEqual(['1.7', 'KB'])
+    expect(bytesToHumanSize(1000)).toEqual(['1', 'kB'])
+    expect(bytesToHumanSize(1000 * 1.5)).toEqual(['1.5', 'kB'])
+    expect(bytesToHumanSize(1000 * 1.666, 1)).toEqual(['1.7', 'kB'])
   })
 
   it('should return mb with proper digits', () => {
-    expect(bytesToHumanSize(1024 * 1024)).toEqual(['1', 'MB'])
-    expect(bytesToHumanSize(1024 * 1024 * 1.5)).toEqual(['1.5', 'MB'])
-    expect(bytesToHumanSize(1024 * 1024 * 1.666, 1)).toEqual(['1.7', 'MB'])
+    expect(bytesToHumanSize(1000 * 1000)).toEqual(['1', 'MB'])
+    expect(bytesToHumanSize(1000 * 1000 * 1.5)).toEqual(['1.5', 'MB'])
+    expect(bytesToHumanSize(1000 * 1000 * 1.666, 1)).toEqual(['1.7', 'MB'])
   })
 
   // larger...
diff --git a/packages/rolldown/src/app/utils/format.ts b/packages/rolldown/src/app/utils/format.ts
index 87148dff..30a9bfb6 100644
--- a/packages/rolldown/src/app/utils/format.ts
+++ b/packages/rolldown/src/app/utils/format.ts
@@ -1,11 +1,11 @@
 import type { ModuleDest, ModuleTreeNode } from '../../shared/types'
 
 export function bytesToHumanSize(bytes: number, digits = 2) {
-  const sizes = ['Bytes', 'KB', 'MB', 'GB', 'TB']
-  const i = Math.floor(Math.log(bytes) / Math.log(1024))
+  const sizes = ['Bytes', 'kB', 'MB', 'GB', 'TB']
+  const i = Math.floor(Math.log(bytes) / Math.log(1000))
   if (i === 0)
     return [bytes, 'B']
-  return [(+(bytes / 1024 ** i).toFixed(digits)).toLocaleString(), sizes[i]]
+  return [(+(bytes / 1000 ** i).toFixed(digits)).toLocaleString(), sizes[i]]
 }
 
 export function getContentByteSize(content: string) {