Speed Unit Converter

Convert between different speed units: mph, km/h, m/s, knots, ft/s, and more.

Speed Value Enter the speed value you want to convert.

From Unit Select the current unit of your speed value.

1 mph = 1.60934 km/h = 0.44704 m/s = 0.868976 knots = 1.46667 ft/s
1 km/h = 0.621371 mph = 0.277778 m/s = 0.539957 knots = 0.911344 ft/s
Speed limits in the US are in mph, while most other countries use km/h
Most vehicle speedometers show both mph and km/h
Racing cars and high-performance metrics often use m/s
Knots are used in marine and aviation contexts (1 knot = 1 nautical mile per hour)
The speed of sound (Mach 1) at sea level is approximately 761.2 mph (1,225 km/h)