Convert between km/h, mph, m/s, knots and ft/s.
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How do you convert km/h to mph and other speed units?
Each speed is converted to metres per second, then to the target unit; for example, 1 mph = 0.44704 m/s and 1 knot = 0.514444 m/s. So 100 km/h = 62.137 mph = 27.778 m/s = 53.996 knots. A knot is one nautical mile per hour, used in aviation and at sea.
Understanding your result
A knot is one nautical mile per hour, used in aviation and at sea. km/h and mph are the common road-speed units.
Formula and method
Each speed is converted to metres per second, then to the target unit. For example, 1 mph = 0.44704 m/s and 1 knot = 0.514444 m/s.
Worked example
100 km/h = 62.137 mph = 27.778 m/s = 53.996 knots.
How to use this tool
- Enter the speed.
- Choose the units to convert from and to.
- Read the result and the full unit table.
Common mistakes to avoid
- Confusing kph and mph on speed limits — 100 km/h is only about 62 mph.
About the Speed Converter
Convert a speed between km/h, mph, m/s, knots and ft/s. Enter a value and read every unit at once.
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Frequently asked questions
What is 100 km/h in mph?
100 km/h is about 62.14 mph.
What is a knot?
A knot is one nautical mile per hour, roughly 1.852 km/h.