MPH to KM/H Converter
Convert miles per hour to kilometers per hour and back instantly.
Common Speed Conversions
Frequently used speed limits converted from miles per hour to kilometers per hour.
| Miles per hour (mph) | Kilometers per hour (km/h) |
|---|---|
| 20 mph | 32.19 km/h |
| 30 mph | 48.28 km/h |
| 50 mph | 80.47 km/h |
| 60 mph | 96.56 km/h |
| 70 mph | 112.65 km/h |
| 100 mph | 160.93 km/h |
MPH and KM/H Relationship
Miles per hour (mph) and kilometers per hour (km/h) are both units of speed, expressing the distance traveled in one hour. They differ only in the unit of distance used: one is based on the statute mile and the other on the kilometer.
Since one mile equals exactly 1.609344 kilometers, the conversion is a simple multiplication or division:
- 1 mph = 1.609344 km/h (multiply mph by 1.609344)
- 1 km/h = 0.621371 mph (divide km/h by 1.609344)
Where MPH and KM/H Are Used
The unit used for speed depends largely on the country. Understanding both is essential for driving abroad, reading vehicle dashboards, and interpreting speed limits while traveling.
- Miles per hour (mph): Used for road speed limits in the United States, the United Kingdom, and a handful of other countries and territories.
- Kilometers per hour (km/h): The standard for road speed limits across most of the world, including Europe, Asia, Africa, and South America.
- Driving abroad: A rental car in continental Europe shows km/h, while a UK car shows mph, so converting helps you stay within the legal limit.