A speed converter converts between common speed units: mph, km/h, m/s, knots, and Mach number. Speed is distance per unit time — the SI unit is meters per second (m/s), but km/h and mph are more common in everyday use.
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Pro Tip
To quickly convert km/h to mph: divide by 1.6 (or multiply by 0.625). To go from mph to km/h: multiply by 1.6. 100 km/h ≈ 62 mph.
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Did You Know?
The official land speed record is 763.035 mph (1,228 km/h), set by Andy Green in the Thrust SSC jet car in 1997 — faster than the speed of sound. The car produced shock waves visible on cameras.
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