Speed Converter
Formula
Try other calculators
Meters, feet, miles and more.
Celsius, Fahrenheit, Kelvin and more.
m², acres, hectares and more.
How the speed converter works
Enter a speed in any unit — km/h, mph, m/s, knots, ft/s — and see it instantly in all five, with a swap button and precision control. Everything converts through m/s internally.
Everyday benchmarks
100 km/h = 62 mph, highway speed. 10 m/s = 36 km/h, a fast sprint. 1 knot = 1.85 km/h, the mariner's mile-per-hour.
Frequently asked questions
How fast is 100 km/h in mph?
62.1 mph — the classic highway conversion. 1 mph = 1.609 km/h exactly.
What is a knot?
One nautical mile per hour (1.852 km/h) — the standard for ships and aircraft, tied to latitude like the nautical mile.
Why do the UK and US use mph?
Historical road-sign inertia, same story as miles. Science and most speedometers elsewhere use km/h.
How do I convert pace (min/km) to speed?
Divide 60 by the pace: 6 min/km = 10 km/h. (A dedicated pace converter is coming soon.)