About Speed Units
Speed measures the distance traveled per unit of time. m/s is the SI unit. km/h and mph are used in everyday transport. Knots are used in aviation and maritime navigation. Mach is the ratio to the speed of sound (~340 m/s).
Quick Reference Table
| Unit | In m/s |
|---|---|
| 1 km/h | 0.27778 m/s |
| 1 mph | 0.44704 m/s |
| 1 knot | 0.51444 m/s |
| Mach 1 | 340.29 m/s |
| 1 ft/s | 0.3048 m/s |
