Speed converter

Speed is distance over time: km/h in Thailand and most of the world, mph in the US and UK, knots at sea and in the air.

Precision Formula and table →

Common conversions

kilometres per hour → miles per hour miles per hour → kilometres per hour metres per second → kilometres per hour knot → kilometres per hour

1 metres per second equals

kilometres per hour (km/h)	3.6
miles per hour (mph)	2.23694
knot (kn)	1.94384
feet per second (ft/s)	3.28084
Mach (speed of sound) (Ma)	0.00291545

Every Speed conversion

metres per second (m/s)

kilometres per hour (km/h)

miles per hour (mph)

knot (kn)

feet per second (ft/s)

Mach (speed of sound) (Ma)

About Speed units

kilometres per hour (km/h): The speed unit on Thai road signs.
miles per hour (mph): Used in the US and UK.
knot (kn): Nautical miles per hour.
Mach (speed of sound) (Ma): About 343 m/s in air at 20 °C.

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