Precision unit conversion
Speed conversions come up constantly when driving abroad, reading weather forecasts, or dealing with boats and aircraft, which use nautical miles per hour (knots) rather than mph or km/h.
| Convert | Result |
|---|---|
| 1 mph | 1.60934 km/h (0.44704 m/s) |
| 1 km/h | 0.62137 mph (0.27778 m/s) |
| 1 knot | 1.15078 mph (1.852 km/h) |
| 60 mph | 96.56 km/h |
| 100 km/h | 62.14 mph |
| 50 mph (typical UK limit) | 80.47 km/h |
mph → km/h: multiply by 1.60934. km/h → mph: multiply by 0.62137 (or divide by 1.60934). Knots are based on the nautical mile (1.852 km), so 1 knot = 1.852 km/h — this is why aviation and marine speeds don't line up neatly with road speed limits.
The full converter switches between mph, km/h, m/s and knots instantly, useful for driving abroad, sailing, weather forecasts and school physics.
Open Speed converter →Multiply mph by 1.60934. So 70 mph (a common UK motorway limit) is about 112.65 km/h.
One knot is about 1.15078 mph, since a nautical mile (1.852 km) is longer than a standard mile (1.60934 km).
Metres per second is the SI (scientific) unit for speed, used in physics, engineering and meteorology — for example, wind speeds are often given in m/s in scientific contexts even though forecasts usually show mph or km/h.