content/snippets/js/s/convert-miles-km.md
---
title: Convert between miles and kilometers in JavaScript
shortTitle: Convert between miles and kilometers
type: tip
language: javascript
tags: [math]
cover: rocky-beach-2
excerpt: Easily apply the mile to kilometer and kilometer to mile formulas.
listed: false
dateModified: 2023-09-13
---
## Miles to kilometers
In order to convert from miles to kilometers, you can use the conversion formula `km = mi * 1.609344`.
```js
const milesToKm = miles => miles * 1.609344;
milesToKm(5); // ~8.04672
```
## Kilometers to miles
Conversely, the conversion formula from kilometers to miles is `mi = km * 0.621371`.
```js
const kmToMiles = km => km * 0.621371;
kmToMiles(8.1) // 5.0331051
```