Km/h to mph conversion formula
1 kilometer/hour = 0.621371 mile/hour
Kilometers per hour (km/h) is the standard road-speed unit worldwide.
Miles per hour (mph) is the speed unit on US and UK roads.
Km/h to mph conversion table
| km/h | mph |
|---|---|
| 1 km/h | 0.621371 mph |
| 2 km/h | 1.2427 mph |
| 3 km/h | 1.8641 mph |
| 5 km/h | 3.1069 mph |
| 10 km/h | 6.2137 mph |
| 20 km/h | 12.4274 mph |
| 25 km/h | 15.5343 mph |
| 50 km/h | 31.0686 mph |
| 100 km/h | 62.1371 mph |
| 250 km/h | 155.3428 mph |
| 500 km/h | 310.6856 mph |
| 1000 km/h | 621.3712 mph |
How to convert km/h to mph
- Write down the value in km/h you want to convert.
- Multiply it by 0.621371 — or use the converter above, which does it instantly.
- Read your result in mph. Done.
Frequently asked questions
How many mph is 1 km/h?
Using the official conversion factor, 1 kilometer/hour = 0.621371 mile/hour. The converter above handles any value instantly.
What is the formula to convert kilometer/hour to mile/hour?
1 kilometer/hour = 0.621371 mile/hour. Multiply any value in km/h by this factor to get mph.
Is this km/h to mph converter free?
Yes — 100% free, unlimited, with no sign-up. CalculUnits is funded by non-intrusive ads, never by paywalls.