diff --git a/__tests__/util.test.ts b/__tests__/util.test.ts
index f88bcd7..745ec98 100644
--- a/__tests__/util.test.ts
+++ b/__tests__/util.test.ts
@@ -309,6 +309,32 @@ describe('parseBool', () => {
   });
 });
 
+describe('formatFileSize', () => {
+  test('should return "0 Bytes" when given 0 bytes', () => {
+    expect(Util.formatFileSize(0)).toBe('0 Bytes');
+  });
+  test('should format bytes to KB correctly', () => {
+    expect(Util.formatFileSize(1024)).toBe('1 KB');
+    expect(Util.formatFileSize(2048)).toBe('2 KB');
+    expect(Util.formatFileSize(1500)).toBe('1.46 KB');
+  });
+  test('should format bytes to MB correctly', () => {
+    expect(Util.formatFileSize(1024 * 1024)).toBe('1 MB');
+    expect(Util.formatFileSize(2.5 * 1024 * 1024)).toBe('2.5 MB');
+    expect(Util.formatFileSize(3.8 * 1024 * 1024)).toBe('3.8 MB');
+  });
+  test('should format bytes to GB correctly', () => {
+    expect(Util.formatFileSize(1024 * 1024 * 1024)).toBe('1 GB');
+    expect(Util.formatFileSize(2.5 * 1024 * 1024 * 1024)).toBe('2.5 GB');
+    expect(Util.formatFileSize(3.8 * 1024 * 1024 * 1024)).toBe('3.8 GB');
+  });
+  test('should format bytes to TB correctly', () => {
+    expect(Util.formatFileSize(1024 * 1024 * 1024 * 1024)).toBe('1 TB');
+    expect(Util.formatFileSize(2.5 * 1024 * 1024 * 1024 * 1024)).toBe('2.5 TB');
+    expect(Util.formatFileSize(3.8 * 1024 * 1024 * 1024 * 1024)).toBe('3.8 TB');
+  });
+});
+
 // See: https://github.com/actions/toolkit/blob/a1b068ec31a042ff1e10a522d8fdf0b8869d53ca/packages/core/src/core.ts#L89
 function getInputName(name: string): string {
   return `INPUT_${name.replace(/ /g, '_').toUpperCase()}`;
diff --git a/src/util.ts b/src/util.ts
index e3479cf..14a7da4 100644
--- a/src/util.ts
+++ b/src/util.ts
@@ -166,4 +166,12 @@ export class Util {
         throw new Error(`parseBool syntax error: ${str}`);
     }
   }
+
+  public static formatFileSize(bytes: number): string {
+    if (bytes === 0) return '0 Bytes';
+    const k = 1024;
+    const sizes = ['Bytes', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'];
+    const i = Math.floor(Math.log(bytes) / Math.log(k));
+    return parseFloat((bytes / Math.pow(k, i)).toFixed(2)) + ' ' + sizes[i];
+  }
 }