Kilometre per Hour to Mile per Hour
Free instant kilometre per hour to mile per hour converter. 1 km/h = 0.621371 mph.
Common Kilometre per Hour to Mile per Hour values
| Kilometre per Hour (km/h) | Mile per Hour (mph) |
|---|---|
| 1 | 0.621371 |
| 5 | 3.10686 |
| 10 | 6.21371 |
| 25 | 15.5343 |
| 50 | 31.0686 |
| 100 | 62.1371 |
| 500 | 310.686 |
| 1000 | 621.371 |
How does Kilometre per Hour to Mile per Hour conversion work?
Type a value in the Kilometre per Hour (km/h) field and the equivalent in Mile per Hour (mph) appears instantly to the right. The math uses the exact formula shown above — no rounding errors, no approximations beyond standard floating-point precision. Use the swap button to flip the units and see the inverse conversion.
Kilometre per Hour. The standard road-speed unit in most metric countries. 100 km/h is the typical highway speed.
Mile per Hour. The standard road-speed unit in the US and UK. 60 mph is roughly highway speed.
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No submit button — the result updates as you type. Math runs entirely in your browser, so it’s as fast as your device.
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🎯 Accurate conversions
Conversion factors come from the official standard (NIST, BIPM, ISO definitions where applicable). Values are precise to standard floating-point limits.
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