Speed converters
12 conversions between 6 speed units. Every page includes a live converter, the formula and a full conversion table.
Units covered
| Unit | Symbol | In meter per seconds |
|---|---|---|
| Meter per second | m/s | 1 |
| Kilometer per hour | km/h | 0.2777778 |
| Mile per hour | mph | 0.44704 |
| Knot | kn | 0.5144444 |
| Foot per second | ft/s | 0.3048 |
| Mach | M | 340.29 |
All speed conversions
- Meters Per Second to Kilometers Per Hour
- Meters Per Second to Miles Per Hour
- Meters Per Second to Knots
- Kilometers Per Hour to Meters Per Second
- Kilometers Per Hour to Miles Per Hour
- Kilometers Per Hour to Knots
- Miles Per Hour to Meters Per Second
- Miles Per Hour to Kilometers Per Hour
- Miles Per Hour to Knots
- Knots to Meters Per Second
- Knots to Kilometers Per Hour
- Knots to Miles Per Hour
The units and where each is used
Road speeds are kilometres or miles per hour, air and sea speeds are knots, and physics is metres per second. A knot is one nautical mile per hour, and a nautical mile is exactly 1,852 m — chosen because it is one minute of latitude, which makes navigation arithmetic on a chart trivial. That is why aviation and shipping kept it while everything else moved on.
Mach is not a fixed speed
Mach 1 is the local speed of sound, which depends on air temperature and therefore on altitude. It is about 1,225 km/h at sea level on a standard day and around 1,062 km/h in the stratosphere, where airliners cruise. The figure used here is the sea-level standard, so treat a Mach conversion as an approximation unless you know the conditions.