Speed converter

Type a number to convert instantly and see every unit in the table below.

Popular conversions

1 mph = 1.609344 km/h, and 100 km/h ≈ 62.1 mph
1 m/s = 3.6 km/h. Wind speed is often given in m/s or knots.
1 knot = 1 nautical mile per hour = 1.852 km/h, used at sea and in the air.
Mach 1 depends on air temperature. This converter uses 340.294 m/s (about 1,225 km/h), the speed of sound at sea level and 15 °C.