---
title: Number to decimal mark
type: snippet
language: javascript
tags: [math]
cover: blue-bench
dateModified: 2020-10-22T20:24:30+03:00
---

Converts a number to a decimal mark formatted string.

- Use `Number.prototype.toLocaleString()` to convert the number to decimal mark format.

```js
const toDecimalMark = num => num.toLocaleString('en-US');
```

```js
toDecimalMark(12305030388.9087); // '12,305,030,388.909'
```