How to convert kilometers per hour to miles per hour
To convert kilometers per hour to miles per hour, multiply by 0.621371192237. Speed conversions are used for driving, aviation, sailing, sports and physics problems.
Kilometer per Hour to Mile per Hour conversion table
| Kilometer per Hour (km/h) | Mile per Hour (mph) |
|---|---|
| 0.1 km/h | 0.0621371192237 mph |
| 0.5 km/h | 0.310685596119 mph |
| 1 km/h | 0.621371192237 mph |
| 2 km/h | 1.24274238447 mph |
| 3 km/h | 1.86411357671 mph |
| 4 km/h | 2.48548476895 mph |
| 5 km/h | 3.10685596119 mph |
| 10 km/h | 6.21371192237 mph |
| 20 km/h | 12.4274238447 mph |
| 25 km/h | 15.5342798059 mph |
| 50 km/h | 31.0685596119 mph |
| 100 km/h | 62.1371192237 mph |
| 500 km/h | 310.685596119 mph |
| 1,000 km/h | 621.371192237 mph |
About the units
Kilometer per Hour (km/h)
Kilometers per hour is the road speed unit used in most of the world.
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.
How to use this converter
- Type the number of kilometers per hour (km/h) in the input box.
- The result in miles per hour appears instantly — no button needed.
- See the same value in every other speed unit just below.
- Use “Swap units” to convert miles per hour back to kilometers 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 miles per hour are in one kilometer per hour?
One kilometer per hour equals 0.621371192237 miles per hour. 0.621371192237 is the exact factor used by this converter.
How do I convert kilometers per hour to miles per hour?
Multiply the value in kilometers per hour by 0.621371192237. To go the other way, multiply miles per hour by 1.609344.
What is 10 km/h in mph?
10 km/h = 6.21371192237 mph. Also, 5 km/h = 3.10685596119 mph and 100 km/h = 62.1371192237 mph.
What is the difference between a kilometer per hour and a mile per hour?
Kilometers per hour is the road speed unit used in most of the world. Miles per hour is the road speed unit in the US and UK; 1 mph is exactly 0.44704 m/s.
Is this tool free and private?
Yes — the Kilometer per Hour to Mile 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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