Speed Converter
Convert speed units instantly: metre per second, kilometre per hour, mile per hour, knot, foot per second, Mach (sea level, 15 °C) and more. Precise factors, all units shown at once.
| Unit | Value |
|---|---|
| metre per second (m/s) | |
| kilometre per hour (km/h) | |
| mile per hour (mph) | |
| knot (kn) | |
| foot per second (ft/s) | |
| Mach (sea level, 15 °C) (Mach) | |
| speed of light (c) |
Tip: double-click a row to convert from that unit. Click a value to copy it. Expressions like 3*12 are accepted.
How to use the Speed Converter
- Type the value you want to convert (expressions are allowed).
- Choose the unit you are converting from.
- Read the result in every other unit in the table — it updates as you type.
About this tool
Enter a value and choose its unit; the speed is converted to all 7 supported units simultaneously. Conversions use exact definitions where they exist (e.g. 1 inch = 25.4 mm, 1 lb = 0.453 592 37 kg).
Common conversions
| 1 m/s = 3.6 km/h | 1 km/h = 0.2777777778 m/s |
| 1 m/s = 2.236936292 mph | 1 mph = 0.44704 m/s |
| 1 m/s = 1.943844492 kn | 1 kn = 0.5144444444 m/s |
| 1 m/s = 3.280839895 ft/s | 1 ft/s = 0.3048 m/s |
| 1 m/s = 0.0029386354 Mach | 1 Mach = 340.294 m/s |
| 1 m/s = 3.335640952 × 10⁻⁹ c | 1 c = 299 792 458 m/s |