km/h ↔ mph converter

Convert a speed between kilometers per hour (km/h) and miles per hour (mph). Local calculation, no API.

Type a value in either field and click convert.

Reference: 1 mile = 1.60934 kilometers.

km/h vs mph

km/h (kilometers per hour) is common in most countries. mph (miles per hour) is widely used in the US and UK road speed limits.

This converter uses the standard factor 1 mi = 1.60934 km.