All conversions
| Unit | Value | Copy |
|---|---|---|
| Metres per second (m/s) | — | |
| Kilometres per hour (km/h) | — | |
| Miles per hour (mph) | — | |
| Feet per second (ft/s) | — | |
| Knot (kn) | — | |
| Mach (sea level) (Ma) | — |
Convert driving, running, wind or aircraft speeds between metric, imperial and nautical units.
How to use the Speed Converter
- 1 Type a value in either box — the conversion works in both directions.
- 2 Choose the units to convert speed from and to, or click any row in the table.
- 3 Use the swap button to reverse the conversion, then copy the result.
Formula
1 km/h = 1/3.6 m/s 1 mph = 1.609344 km/h = 0.44704 m/s 1 knot = 1.852 km/h
Worked examples
Input: 70 mph
Result: 112.65 km/h
Input: 20 knots
Result: 37.04 km/h
10.29 m/s
Mach number
Mach 1 is the speed of sound, which depends on air temperature. This converter uses 340.29 m/s — the speed of sound at sea level in the International Standard Atmosphere (15 °C). At cruising altitude Mach 1 is closer to 295 m/s.
Running pace
Runners often think in pace rather than speed. 10 km/h equals a pace of 6:00 min/km; 6 mph equals 10:00 min/mile.
Frequently asked questions
How do I convert km/h to mph?
Divide by 1.609344. For example, 100 km/h ≈ 62.14 mph.
How do I convert m/s to km/h?
Multiply by 3.6.
What is a knot?
One nautical mile per hour — exactly 1.852 km/h.
Related tools
Length Converter
Convert between metres, kilometres, centimetres, millimetres, miles, yards, feet, inches and nautical miles.
Weight Converter
Convert mass between kilograms, grams, milligrams, tonnes, pounds, ounces, stones and US/UK tons.
Temperature Converter
Convert between Celsius, Fahrenheit, Kelvin and Rankine — with absolute-zero validation.
Area Converter
Convert square metres, square feet, acres, hectares, square miles, square kilometres and more.
Volume Converter
Convert litres, millilitres, cubic metres, US and UK gallons, quarts, pints, cups, fluid ounces and spoons.
Data Storage Converter
Data storage converter: convert bits and bytes to KB, MB, GB, TB and PB in decimal (SI) and binary (KiB, MiB, GiB) units.