Convert speed between m/s, km/h, mph, knots, and Mach.
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Speed is a physical quantity that describes how fast an object moves through space — the ratio of distance traveled to time elapsed.
Main Speed Measurement Units
- m/s — the SI base unit, standard in science and engineering.
- km/h — the standard for road and ground transportation.
- mph (miles per hour) — used in the US, the UK, and a few other countries.
- Knot — one nautical mile per hour; the standard in maritime navigation and aviation.
- Mach — the ratio of an object's speed to the speed of sound; used for supersonic speeds.