Speed Converter
Speed & Velocity Converter
Use the converter above to instantly convert between any two units of speed. This converter supports kilometers per hour, meters per second, miles per hour, knots, Mach, and feet per second — covering every speed conversion you are likely to need.
Whether you are converting speed limits while traveling, calculating wind speed, working with aviation data, or doing physics problems, this free converter gives you an instant accurate result.
How to convert speed units
Speed conversions are straightforward multiplications. The key relationship is that 1 mile = 1.60934 kilometers, so 1 mph = 1.60934 km/h. To convert km/h to mph, divide by 1.60934 (or multiply by 0.6214).
Meters per second is the SI standard unit for speed. To convert m/s to km/h, multiply by 3.6. To convert km/h to m/s, divide by 3.6. For example, 100 km/h ÷ 3.6 = 27.78 m/s.
Knots are used in aviation and maritime navigation. One knot equals one nautical mile per hour = 1.852 km/h = 1.15078 mph. Mach number is the ratio of speed to the speed of sound — Mach 1 ≈ 1,235 km/h at sea level, but this varies with temperature and altitude.
km/h to mph conversion table
| km/h | mph | m/s |
|---|---|---|
| 10 km/h | 6.214 mph | 2.778 m/s |
| 30 km/h | 18.641 mph | 8.333 m/s |
| 50 km/h | 31.069 mph | 13.889 m/s |
| 60 km/h | 37.282 mph | 16.667 m/s |
| 80 km/h | 49.710 mph | 22.222 m/s |
| 100 km/h | 62.137 mph | 27.778 m/s |
| 120 km/h | 74.565 mph | 33.333 m/s |
| 150 km/h | 93.206 mph | 41.667 m/s |
| 200 km/h | 124.274 mph | 55.556 m/s |
| 300 km/h | 186.411 mph | 83.333 m/s |