Convert miles per hour to kilometers per hour
Enter a value in miles per hour to convert it to kilometers per hour.
miles per hour to kilometers per hour reference
| miles per hour | kilometers per hour |
|---|---|
| 1 mph | 1.6093 km/h |
| 2 mph | 3.2187 km/h |
| 5 mph | 8.0467 km/h |
| 10 mph | 16.0934 km/h |
| 25 mph | 40.2336 km/h |
| 50 mph | 80.4672 km/h |
| 100 mph | 160.9344 km/h |
The conversion factor
One mile per hour is 1.609344 kilometers per hour. So to convert, multiply your figure in miles per hour by 1.609344. To go the other way, multiply kilometers per hour by 0.62137119, or use the kilometers per hour to miles per hour converter.
Doing it in your head
For a quick estimate, round the factor: roughly "times 2". Use the exact converter above when the number matters.
Where this conversion comes up
Driving abroad, running and cycling pace, wind speed, and vehicle specs.
See the common unit conversions cheat sheet for the factors worth memorising.
Related tools
Frequently asked questions
How many kilometers per hour are in a mile per hour?
1 mile per hour = 1.609344 kilometers per hour.
What is the formula to convert miles per hour to kilometers per hour?
Multiply the number of miles per hour by 1.609344. To go back the other way, multiply kilometers per hour by 0.62137119.
What is 10 miles per hour in kilometers per hour?
10 miles per hour = 16.0934 kilometers per hour. The reference table below lists more common values.
Is this converter accurate?
It uses the internationally defined conversion factors and computes at full floating-point precision, then rounds only the displayed result. For everyday purposes it is exact; for legal, engineering or scientific work, confirm the required number of significant figures.
Does it work offline?
Yes. The conversion runs in your browser with no server call, so it keeps working with no connection, and nothing you enter is uploaded.
Last reviewed: September 2026. Figures and formulas are checked against their published sources; see the site's data notes.