How to convert miles per hour to kilometers per hour
To convert miles per hour to kilometers per hour, multiply by 1.609344. Speed conversions are used for driving, aviation, sailing, sports and physics problems.
Mile per Hour to Kilometer per Hour conversion table
| Mile per Hour (mph) | Kilometer per Hour (km/h) |
|---|---|
| 0.1 mph | 0.1609344 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 |
| 20 mph | 32.18688 km/h |
| 25 mph | 40.2336 km/h |
| 50 mph | 80.4672 km/h |
| 100 mph | 160.9344 km/h |
| 500 mph | 804.672 km/h |
| 1,000 mph | 1,609.344 km/h |
About the units
Mile per Hour (mph)
Miles per hour is the road speed unit in the US and UK; 1 mph is exactly 0.44704 m/s.
Kilometer per Hour (km/h)
Kilometers per hour is the road speed unit used in most of the world.
How to use this converter
- Type the number of miles per hour (mph) in the input box.
- The result in kilometers per hour appears instantly — no button needed.
- See the same value in every other speed unit just below.
- Use “Swap units” to convert kilometers per hour back to miles per hour.
Tips for better results
- Double-check which system a unit belongs to (for example US vs UK gallons).
- Use the swap button to convert in the opposite direction instantly.
- Bookmark the conversions you use most — each pair has its own page.
Frequently asked questions
How many kilometers per hour are in one mile per hour?
One mile per hour equals 1.609344 kilometers per hour. 1.609344 is the exact factor used by this converter.
How do I convert miles per hour to kilometers per hour?
Multiply the value in miles per hour by 1.609344. To go the other way, multiply kilometers per hour by 0.621371192237.
What is 10 mph in km/h?
10 mph = 16.09344 km/h. Also, 5 mph = 8.04672 km/h and 100 mph = 160.9344 km/h.
What is the difference between a mile per hour and a kilometer per hour?
Miles per hour is the road speed unit in the US and UK; 1 mph is exactly 0.44704 m/s. Kilometers per hour is the road speed unit used in most of the world.
Is this tool free and private?
Yes — the Mile per Hour to Kilometer per Hour is completely free with no sign-up, and it runs entirely in your browser, so the values you enter are never uploaded to our servers.
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