How to convert miles per hour to kilometres per hour
km/h = mph × 1.609344
Example: 5 mph × 1.609344 = 8.04672 km/h
Miles per Hour to Kilometers per Hour table
| Miles per Hour (mph) | Kilometers per Hour (km/h) |
|---|---|
| 0.5 mph | 0.804672 km/h |
| 1 mph | 1.609344 km/h |
| 2 mph | 3.218688 km/h |
| 3 mph | 4.828032 km/h |
| 4 mph | 6.437376 km/h |
| 5 mph | 8.04672 km/h |
| 6 mph | 9.656064 km/h |
| 7 mph | 11.265408 km/h |
| 8 mph | 12.874752 km/h |
| 9 mph | 14.484096 km/h |
| 10 mph | 16.09344 km/h |
| 15 mph | 24.14016 km/h |
| 20 mph | 32.18688 km/h |
| 25 mph | 40.2336 km/h |
| 30 mph | 48.28032 km/h |
| 40 mph | 64.37376 km/h |
| 50 mph | 80.4672 km/h |
| 75 mph | 120.7008 km/h |
| 100 mph | 160.9344 km/h |
| 250 mph | 402.336 km/h |
| 500 mph | 804.672 km/h |
| 1,000 mph | 1,609.344 km/h |
About these units
Miles per Hour (mph): Miles per hour (mph) is used for road speeds in the US and UK. 1 mph is exactly 1.609344 km/h.
Kilometers per Hour (km/h): Kilometres per hour (km/h) is the speed unit on road signs and speedometers in most of the world.
Frequently asked questions
How many kilometres per hour are in 1 mile per hour?
1 mile per hour (mph) equals 1.609344 kilometres per hour (km/h).
How do I convert mph to km/h?
Multiply the value in miles per hour by 1.609344. For example, 5 mph × 1.609344 = 8.04672 km/h.
How do I convert kilometres per hour back to miles per hour?
Multiply by 0.6213711922 (or divide by 1.609344). 1 km/h = 0.6213711922 mph.
What does mph mean?
Miles per hour (mph) is used for road speeds in the US and UK. 1 mph is exactly 1.609344 km/h.
Conversion factors come from exact international definitions (NIST SP 811, BIPM) where they exist. Results show up to 10 significant digits. Need every speed unit at once? Use the Speed Converter.