Convert Miles per hour to Kilometer per hour

Speed conversions are common for driving speeds, aviation, and sailing. Kilometers per hour is the metric standard, while miles per hour is used in the US and UK, and knots remain the reference at sea and in aviation.

Kilometers per hour (km/h) is the road reference in Europe, miles per hour (mph) in the US and UK, the knot in navigation and aviation, and meters per second (m/s) in physics. Mach expresses a speed relative to the speed of sound. Here is a conversion table for the most searched values:

km/h	m/s	mph
10 km/h	2.78 m/s	6.21 mph
30 km/h	8.33 m/s	18.64 mph
50 km/h	13.89 m/s	31.07 mph
90 km/h	25 m/s	55.92 mph
100 km/h	27.78 m/s	62.14 mph
130 km/h	36.11 m/s	80.78 mph
1 Mach (air, sea level)	340.3 m/s	1,225 km/h

For a precise value not listed here, use the converter above.