Convert any speed unit
Pick any two units and convert between them: metres per second, kilometres per hour, miles per hour, feet per second and knots. The result updates as you type, and a negative value is accepted for a speed in the opposite direction.
Every unit is defined against the metre per second. The mile per hour is exactly 0.44704 m/s, and the knot is exactly one nautical mile per hour.
Units at a glance
| Unit | Symbol | Size |
|---|---|---|
| metres per second | m/s | The base unit for speed. |
| kilometres per hour | km/h | 1 kilometre per hour = 0.277777777778 metres per second |
| miles per hour | mph | 1 mile per hour = 0.44704 metres per second |
| feet per second | ft/s | 1 foot per second = 0.3048 metres per second |
| knots | kn | 1 knot = 0.514444444444 metres per second |
Knots
A knot is one nautical mile (1,852 m) per hour. It is used for the speed of ships and aircraft and for wind speed in marine forecasts.
km/h, kph and kmph
These are all ways of writing kilometres per hour. The official symbol is km/h.