How do I convert mph to km/h or knots to km/h?
Speed converter: kilometers per hour, miles per hour, meters per second, knots, feet per second, Mach. Useful for travel, sports, aviation, sailing.
Type a value in one unit, see the conversion to all the others.
How to use it
- Type a value and pick a unit.
- The other speed units show the conversion automatically.
- Click any tile to copy the result.
When this is useful
The most common uses:
- Driving in Europe. "100 km/h speed limit, what's that in mph?" (62 mph). Most of the world uses km/h, US and UK use mph.
- Running and cycling. "I run 12 km/h": that's 7.5 mph or 3.33 m/s. Training apps show different units.
- Aviation. Aircraft speeds are in knots (1 knot = 1.85 km/h). A Cessna cruises at ~120 knots = 222 km/h.
- Sailing. A yacht going 6 knots = 11 km/h. Standard for marine navigation.
- Supersonic flight. "Concorde flew at Mach 2.04" = over 2200 km/h. Mach 1 = the speed of sound ≈ 1235 km/h.
- Education and physics. Speed/time/distance problems. Easy unit conversion.
Questions and answers
1 mph = 1.609 km/h. Easy mental shortcut: multiply mph by 1.6. 60 mph ≈ 96 km/h. 100 mph = 161 km/h. The other way: 100 km/h = 62 mph.