MPH to KM/H Converter
Convert miles per hour to kilometers per hour and back instantly. Type in either box — the other updates as you go.
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The Conversion Factor
1 mph = 1.609344 km/h — the same 1.609 factor that converts miles to kilometers, because it’s a distance-per-hour unit. To convert:
- mph → km/h: multiply by 1.609
- km/h → mph: divide by 1.609 (or multiply by 0.621)
A quick mental estimate: add about 60% to an mph figure to get km/h.
Speed Reference Table
| mph | km/h |
|---|---|
| 20 mph | 32.2 km/h |
| 30 mph | 48.3 km/h |
| 50 mph | 80.5 km/h |
| 60 mph | 96.6 km/h |
| 70 mph | 112.7 km/h |
| 100 mph | 160.9 km/h |
From Distance and Time
Need to work out a speed rather than convert one? The average speed calculator turns distance and time into km/h and mph, and the speed distance time calculator solves for whichever value you’re missing.
Get Distance Measure
Download Distance Measure for iOS and start measuring in seconds.
