Common Converters
Speed Converter
Convert between meters per second, kilometers per hour, miles per hour, knots and Mach. One knot is one nautical mile per hour; Mach numbers are referenced to the speed of sound at 15°C sea level (340.3 m/s).
SPEED CONVERTER — INSTANT RESULT
All supported units — speed
| Unit | Symbol | To meter/second (m/s) | From meter/second (m/s) |
|---|---|---|---|
| Meter/second | m/s | 1 m/s = 1 m/s | 1 m/s = 1 m/s |
| Kilometer/hour | km/h | 1 km/h = 0.27777778 m/s | 1 m/s = 3.6 km/h |
| Meter/minute | m/min | 1 m/min = 0.016666667 m/s | 1 m/s = 60 m/min |
| Mile/hour | mph | 1 mph = 0.44704 m/s | 1 m/s = 2.23693629 mph |
| Foot/second | ft/s | 1 ft/s = 0.3048 m/s | 1 m/s = 3.2808399 ft/s |
| Inch/second | in/s | 1 in/s = 0.0254 m/s | 1 m/s = 39.37007874 in/s |
| Knot | kn | 1 kn = 0.51444444 m/s | 1 m/s = 1.94384449 kn |
| Mach (15°C, sea level) | Ma | 1 Ma = 340.3 m/s | 1 m/s = 0.0029385836 Ma |
| Speed of Light (vacuum) | c | 1 c = 299,792,458 m/s | 1 m/s = 3.33564e-09 c |
| Centimeter/second | cm/s | 1 cm/s = 0.01 m/s | 1 m/s = 100 cm/s |
Popular speed conversions
mph to km/hkm/h to mphm/s to km/hkm/h to m/skn to km/hkn to mphft/s to m/smph to ft/sMa to km/hm/s to mph
Frequently asked questions
What units does this speed converter support?
It supports 10 units: Meter/second (m/s), Kilometer/hour (km/h), Meter/minute (m/min), Mile/hour (mph), Foot/second (ft/s), Inch/second (in/s), Knot (kn), Mach (15°C, sea level) (Ma), Speed of Light (vacuum) (c), Centimeter/second (cm/s).
What is the base unit of speed?
The SI reference unit is the meter/second (m/s). Every conversion is computed by converting the input to the base unit, then from the base unit to the target unit, so chained precision is preserved.
Is this converter accurate?
Yes. Conversion factors use exact legal definitions where they exist (for example 1 in = 25.4 mm exactly) and CODATA/ISO constants otherwise. Results are shown to up to 10 significant figures.