KM/H to MPH Converter
Convert kilometers per hour to miles per hour and back instantly. Type in either box — the other updates as you go.
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The Conversion Factor
1 km/h = 0.621371 mph, and 1 mph = 1.609344 km/h. To convert:
- km/h → mph: multiply by 0.621 (or divide by 1.609)
- mph → km/h: multiply by 1.609
A quick estimate: take about ⅝ of the km/h figure to get mph — so 100 km/h is roughly 62 mph.
Speed Reference Table
| km/h | mph |
|---|---|
| 30 km/h | 18.6 mph |
| 50 km/h | 31.1 mph |
| 80 km/h | 49.7 mph |
| 100 km/h | 62.1 mph |
| 120 km/h | 74.6 mph |
| 130 km/h | 80.8 mph |
Calculate a Speed
To find a speed from a journey instead of converting one, use the average speed calculator, or convert running pace to speed with the pace converter.
Get Distance Measure
Download Distance Measure for iOS and start measuring in seconds.
