content/snippets/js/s/decimal-to-hex.md
---
title: Convert decimal number to hexadecimal
shortTitle: Decimal to hexadecimal
type: tip
language: javascript
tags: [math]
cover: waves-from-above
excerpt: Ever needed to convert a decimal number to hexadecimal? Here's a quick and easy way to do it.
listed: true
dateModified: 2022-09-21
---
Numeric values are represented in decimal format by default, when converted to strings. If you want to display them in hexadecimal format, you can use `Number.prototype.toString()` and pass the base you want to use (`16`) as an argument.
```js
const decimalToHex = dec => dec.toString(16);
decimalToHex(0); // '0'
decimalToHex(255); // 'ff'
```
Conversely, the opposite might also be needed. You can use `parseInt()` to convert a string to a number in a given base. If you don't specify a base, it will default to `10`.
```js
const hexToDecimal = hex => parseInt(hex, 16);
hexToDecimal('0'); // 0
hexToDecimal('ff'); // 255
```