Speed Converter

Convert km/h, mph, m/s, knots and more.

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About the Speed Converter

Speed Converter converts between kilometers per hour, miles per hour, meters per second, feet per second, knots and Mach, useful for driving, aviation, sailing and physics homework.

How to use the Speed Converter

Enter a speed.
Choose the units.
Read the result and the other conversions.

Frequently asked questions

How many km/h is 1 mph?

1 mph equals exactly 1.609344 km/h.

Which Mach value is used?

Mach 1 is taken as 343 m/s, the speed of sound at sea level at 20 °C.