Speed Converters
Convert between kilometers per hour, miles per hour, meters per second, knots, and more speed units.
km/h
Kilometers per hour
mph
Miles per hour
m/s
Meters per second
Knot
Nautical miles per hour
km/h to mph
km/h → mph
Convert kilometers per hour to miles per hour. Ideal for speedometers and speed limits.
mph to km/h
mph → km/h
Convert miles per hour to kilometers per hour. Perfect for understanding international speeds.
Equivalence Table
| km/h | mph | m/s | Knot |
|---|---|---|---|
| 1 km/h | 0.621 mph | 0.278 m/s | 0.540 kt |
| 1.609 km/h | 1 mph | 0.447 m/s | 0.868 kt |
| 3.6 km/h | 2.237 mph | 1 m/s | 1.944 kt |
| 1.852 km/h | 1.151 mph | 0.514 m/s | 1 kt |
🚗 Automobiles
Vehicle speeds vary according to the type of road and local regulations.
Urban area
30-50 km/h (19-31 mph)
Highway
90-120 km/h (56-75 mph)
Formula 1
Up to 370 km/h (230 mph)
✈️ Aviation
Aircraft operate at different speeds depending on their type and flight phase.
Commercial aircraft
850-950 km/h (530-590 mph)
Helicopter
150-300 km/h (93-186 mph)
Supersonic jet
2,000+ km/h (1,240+ mph)
🚢 Navigation
Marine vessels use knots as the standard unit of speed.
Sport sailboat
5-15 knots (9-28 km/h)
Speedboat
25-50 knots (46-93 km/h)
Cruise ship
20-25 knots (37-46 km/h)
🏃♂️ Sports
Speeds in sports show the limits of human and technological performance.
100m world record
37.6 km/h (23.4 mph)
Professional cycling
45-70 km/h (28-43 mph)
Tennis serve
250+ km/h (155+ mph)