mph to km/h Converter
1 mile per hour = 1.609344 kilometers per hour
Type a value in either box: the conversion between miles per hour (mph) and kilometers per hour (km/h) updates instantly.
Good to know
A 70 mph highway limit, common in the US and UK, is about 113 km/h. For a quick estimate, multiply by 1.6.
How to convert miles per hour to kilometers per hour
To convert miles per hour to kilometers per hour, multiply the number of miles per hour by 1.609344. To go the other way, multiply kilometers per hour by 0.6213712.
km/h = mph × 1.609344
Worked examples
- 20 mph = 32.18688 km/h
- 30 mph = 48.28032 km/h
- 60 mph = 96.56064 km/h
- 70 mph = 112.6541 km/h
mph to km/h conversion table
| Mph (mph) | Km/h (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 | 11.26541 km/h |
| 8 mph | 12.87475 km/h |
| 9 mph | 14.4841 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 the units
Mph (mph)
Miles per hour (mph) is the speed unit used on roads in the United States and the United Kingdom.
Km/h (km/h)
Kilometers per hour (km/h) is the speed unit used on road signs and car speedometers in most of the world.
Frequently asked questions
How do I convert miles per hour to kilometers per hour?
km/h = mph × 1.609344What is 30 mph in kilometers per hour?
How many kilometers per hour are in one mile per hour?
How many miles per hour are in one kilometer per hour?
Conversion factors use exact international definitions where they exist (for example 1 inch = 2.54 cm and 1 lb = 0.45359237 kg). Results are rounded for display only.