5 UNITS
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Convert between km/h, mph, metres per second, feet per second and knots. The mile is exactly 1,609.344 m and the nautical mile exactly 1,852 m, so every factor here is exact.
Speed units and their values
| Unit | Symbol | Value |
|---|---|---|
| metres per second | m/s | Base unit |
| kilometres per hour | km/h | 1 km/h = 0.2777777778 m/s |
| feet per second | ft/s | 1 ft/s = 0.3048 m/s |
| miles per hour | mph | 1 mph = 0.44704 m/s |
| knots | kn | 1 kn = 0.5144444444 m/s |
Factors come from each unit’s definition and are applied without rounding; the converter shows 7 significant figures.