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Speed Converters
Convert between MPH, KPH, meters per second, and knots.
Speed measures how fast something moves — distance traveled per unit of time. The SI unit is meters per second (m/s). On roads, miles per hour (mph) is used in the US and UK while kilometers per hour (km/h or kph) is used almost everywhere else. Knots (one nautical mile per hour) are standard in aviation and maritime navigation. Speed conversions are simple multiplications because the units share the same time dimension.
Reviewed August 2026
8 Converters
MPH to KPH
Miles per Hour → Kilometers per Hour
KPH to MPH
Kilometers per Hour → Miles per Hour
Meters/Second to MPH
Meters per Second → Miles per Hour
MPH to Meters/Second
Miles per Hour → Meters per Second
Knots to MPH
Knots → Miles per Hour
MPH to Knots
Miles per Hour → Knots
Knots to KPH
Knots → Kilometers per Hour
KPH to Knots
Kilometers per Hour → Knots
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