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Convert speed.

Kilometres per hour to miles per hour, metres per second to knots, and Mach for the one figure that depends on the air around it.

Speed

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Converted

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Every unit at once 11 units

Common speed conversions

Each of these has its own page with the formula, a values table and both directions.

kilometers per hour to miles per hour km/h → mph knots to miles per hour kn → mph meters per second to kilometers per hour m/s → km/h miles per hour to meters per second mph → m/s knots to kilometers per hour kn → km/h feet per second to miles per hour ft/s → mph Mach to miles per hour Ma → mph

Every speed unit on this page

meter per second m/s: The SI unit of speed, expressing how many metres an object travels each second.
kilometer per hour km/h: How many kilometres are covered each hour, the standard road speed unit nearly everywhere outside the USA and UK.
mile per hour mph: How many miles are covered each hour, used for road speeds in the USA, UK, and a few other countries.
knot kn: One nautical mile per hour, the standard unit of speed for sea and air navigation worldwide.
foot per second ft/s: How many feet are covered each second, often used in engineering and physics applications.
kilometer per second km/s: How many kilometres are covered each second, used for extremely fast objects like spacecraft and atmospheric entry speeds.
centimeter per second cm/s: How many centimetres are covered each second, used in precise measurements and scientific contexts.
inch per second in/s: How many inches are covered each second, used in engineering and some technical applications.
mile per minute mi/min: How many miles are covered each minute, rarely used but appearing in some aviation and racing contexts.
Mach Ma: The speed of sound in the surrounding air. The value used here is Mach 1 at standard sea level (15°C, 101.325 kPa), where it equals 340.29 metres per second — at higher altitudes and different temperatures, the speed of sound differs significantly.
speed of light c: The speed at which light travels through a vacuum, the ultimate cosmic speed limit at 299,792,458 metres per second.

Other converters

Length Weight and mass Temperature Volume Area Time Data storage Cooking volume Pressure Energy Power Force Angle Frequency Data transfer rate Fuel consumption

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