Speed Converter
Convert speed units: km/h, mph, meters per second, knots, feet per second and Mach.
Speed Converter
About the Speed Converter
Convert speeds between kilometers per hour, miles per hour, meters per second, knots and more. Handy for driving abroad, aviation, sailing and physics problems.
How to Use the Speed Converter
- Enter the speed.
- Choose the units to convert from and to.
- Press Calculate.
Formula and How It Works
1 mph = 1.609344 km/h, 1 m/s = 3.6 km/h and 1 knot = 1.852 km/h. Mach 1 is taken as 343 m/s, the speed of sound in air at 20 °C.
Frequently Asked Questions
How do I convert km/h to mph?
Divide by 1.609. For example, 100 km/h is about 62.1 mph.
What is a knot?
A knot is one nautical mile per hour, used in shipping and aviation.