1 km/h equals 0.621371 mph. To convert km/h to mph, multiply the value by 0.621371; divide by 0.621371 to convert back. Enter any number above and the result appears instantly — free and entirely in your browser.
How do you convert km/h to mph?
The conversion formula is mph = km/h × 0.621371. The conversion factor is fixed by definition, so the result is always exact.
km/h to mph conversion table
| km/h | mph |
|---|---|
| 10 km/h | 6.21371 mph |
| 30 km/h | 18.6411 mph |
| 50 km/h | 31.0686 mph |
| 80 km/h | 49.7097 mph |
| 100 km/h | 62.1371 mph |
| 130 km/h | 80.7783 mph |
What is km/h (km/h)?
Kilometres per hour (km/h) is the everyday speed unit for road traffic in most of the world: speedometers, speed limits and weather reports all use it.
What is mph (mph)?
Miles per hour (mph) is the road-speed unit in the US and UK. One mph equals exactly 1.609344 km/h — a 70 mph motorway limit is about 113 km/h.
Why convert km/h to mph?
Road speeds are posted in km/h in most countries but in mph in the US and UK; shipping and aviation use knots, physics and wind data use metres per second. Converting between them is routine for travel, sailing and sport.
One knot is exactly 1.852 km/h — one international nautical mile (1,852 m, standardised in 1929) per hour. And 100 km/h equals 62.137 mph or 27.778 m/s.
How to convert km/h to mph
- Enter the value in km/h into the left field of the converter.
- Read the result in mph instantly in the right field — it updates automatically.
- Use the swap button to reverse the direction (mph to km/h).
The converter runs entirely in your browser: no uploads, no queue, no limits. You can even use it offline.