Speed Converter
Convert between common speed and velocity units.
Ctrl+Enter to convert from first field
Common Conversions
| From | To | Multiply by |
|---|---|---|
| 1 km/h | mph | 0.621371 |
| 1 mph | km/h | 1.60934 |
| 1 knot | mph | 1.15078 |
| 1 m/s | km/h | 3.6 |
| Mach 1 | mph | 767.269 |
| 1 ft/s | mph | 0.681818 |
Frequently Asked Questions
How do I convert km/h to mph? +
Multiply km/h by 0.621371 to get mph. For example, 100 km/h equals about 62.14 mph. To go the other direction, multiply mph by 1.60934.
What is Mach 1 in mph? +
Mach 1 is the speed of sound, approximately 767.269 mph (1,235.08 km/h) at sea level and 20 degrees C. The exact value varies with air temperature and altitude.
What are knots and why do pilots use them? +
One knot equals one nautical mile per hour (about 1.15078 mph). Aviation and maritime industries use knots because nautical miles relate directly to degrees of latitude, making navigation calculations simpler.
How do I convert meters per second to km/h? +
Multiply m/s by 3.6 to get km/h. For example, 10 m/s equals 36 km/h. This works because there are 3,600 seconds in an hour and 1,000 meters in a kilometer.