mph to km/h Converter
Convert miles per hour (mph) to kilometers per hour (km/h) as you type — 1 mph = 1.609344 km/h. Switch units, change the precision or copy the result.
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How to use this tool
Steps for using the Unit Converter.
- Enter a value in From — miles per hour are already selected.
- The result in kilometers per hour appears instantly. Change either unit to convert to anything else in speed.
- Use the swap button for the reverse conversion, and set the decimal places you need.
- Turn on Show formula to see the calculation, then copy or share the result.
Example
1 mph to km/h
1 mphkm/h = 1 × 1.609344 = 1.609344 km/hCommon use cases
- Speed limits and speedometers when driving abroad.
- Running and cycling paces.
- Wind speeds and boat or aircraft speeds in knots.
mph to km/h conversion table
| Mile per hour (mph) | Kilometer per hour (km/h) |
|---|---|
| 0.1 mph | 0.160934 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 |
| 10 mph | 16.09344 km/h |
| 15 mph | 24.14016 km/h |
| Mile per hour (mph) | Kilometer per hour (km/h) |
|---|---|
| 20 mph | 32.18688 km/h |
| 25 mph | 40.2336 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 |
Values rounded to 6 decimal places.
Related conversions
The units
- Mile per hour (mph)
- 1 mi in 1 h = exactly 0.44704 m/s. Part of the US customary system.
- Kilometer per hour (km/h)
- 1,000 m in 3,600 s. Part of the Metric system.
How to convert miles per hour to kilometers per hour
Driving in a country that uses the other unit: 70 mph, the UK motorway limit, is about 113 km/h.
To convert miles per hour to kilometers per hour, use km/h = mph × 1.609344. One mile per hour equals 1.609344 kilometers per hour, and one kilometer per hour equals 0.621371 miles per hour.
Mile per hour (mph): 1 mi in 1 h = exactly 0.44704 m/s. Kilometer per hour (km/h): 1,000 m in 3,600 s.
For the opposite direction, use the km/h to mph converter. All speed units are on the speed converter.
Limitations
- Results are rounded to the decimal places you choose; the calculation itself keeps full precision.
Frequently asked questions
How many kilometers per hour are in a mile per hour?
1 mph = 1.609344 km/h. Multiply miles per hour by 1.609344 (or use km/h = mph × 1.609344).
How do I convert miles per hour to kilometers per hour?
Use km/h = mph × 1.609344. For example, 1 mph = 1.6093 km/h and 10 mph = 16.0934 km/h.
How do I convert km/h to mph quickly?
Divide by 1.609 — or multiply by about 0.62. 100 km/h ≈ 62.1 mph.
How do I convert m/s to km/h?
Multiply by exactly 3.6: 10 m/s = 36 km/h.