Tables showing the SI equivalents of metric units and some older units commonly used, such as Kilometres per Hour (kph) and Miles per Hour (mph)
Units of Speed Table
| Unit | SI equivalent | Inverse |
|---|---|---|
| 1 km h-1 (kph) | equals 0.2778 m s-1 | 1 m s-1 = 3.600 kph |
| 1 mi h-1 (mph) | equals 0.4470 m s-1 | 1 m s-1 = 2.237 mph |
The Royal Society (1975) Quantities, Units and Symbols, London, The Royal Society