diff --git a/.changeset/silver-cheetahs-jam.md b/.changeset/silver-cheetahs-jam.md
new file mode 100644
index 0000000..8412c85
--- /dev/null
+++ b/.changeset/silver-cheetahs-jam.md
@@ -0,0 +1,5 @@
+---
+'@busyxiang/utilities-js': patch
+---
+
+Add number average util
diff --git a/src/number.test.ts b/src/number.test.ts
new file mode 100644
index 0000000..e4c84b5
--- /dev/null
+++ b/src/number.test.ts
@@ -0,0 +1,15 @@
+import { average } from './number';
+
+describe('average', () => {
+  test('it should return average value', () => {
+    const aver = average(1, 2, 3);
+
+    expect(aver).toBe(2);
+  });
+
+  test('it should return average value(spread array)', () => {
+    const aver = average(...[1, 2, 3]);
+
+    expect(aver).toBe(2);
+  });
+});
diff --git a/src/number.ts b/src/number.ts
new file mode 100644
index 0000000..9ab3048
--- /dev/null
+++ b/src/number.ts
@@ -0,0 +1,3 @@
+export const average = (...nums: number[]) => {
+  return nums.reduce((acc, value) => acc + value, 0) / nums.length;
+};