How speed conversion works
Every speed unit has a fixed ratio to meters per second. The value is first converted to m/s, then into the target unit.
Common values
| Value (km/h) | Result |
|---|---|
| 0.1 km/h | 0.0621371 mph |
| 0.25 km/h | 0.155343 mph |
| 0.5 km/h | 0.310686 mph |
| 1 km/h | 0.621371 mph |
| 1.5 km/h | 0.932057 mph |
| 2 km/h | 1.24274 mph |
| 3 km/h | 1.86411 mph |
| 5 km/h | 3.10686 mph |
| 10 km/h | 6.21371 mph |
More detail
Common conversions
1 km/h = 0.2778 m/s. 1 mph = 0.44704 m/s (defined). 1 knot = 1 nautical mile/hour = 0.5144 m/s. 100 km/h ≈ 62.14 mph.
Practical tip. Knots come from nautical miles (1852 m), not statute miles — that's why 1 knot converts differently than 1 mph even though both feel like "miles per hour".
Frequently asked questions
How many mph is 100 km/h?
100 km/h ≈ 62.14 mph. Enter your own value above for the exact conversion.
How many km/h is 1 m/s?
1 m/s = 3.6 km/h exactly, since there are 3,600 seconds in an hour and 1,000 meters in a kilometer.
Why is a knot different from mph?
A knot is 1 nautical mile (1,852 m) per hour, while mph uses the statute mile (1,609.344 m). 1 knot ≈ 1.15078 mph.
Why do ships and aircraft use knots instead of mph?
The nautical mile was defined to equal one minute of latitude, making knots convenient for navigation by latitude/longitude — a convention still standard in marine and air traffic today.