Speed Converter
Convert between mph, km/h, m/s, knots, Mach, and feet per second. Uses exact NIST conversion factors.
mph ↔ km/hm/sKnotsMachft/s
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Speed Conversion Reference
| m/s | km/h | mph | Knots | Description |
|---|---|---|---|---|
| 0.3 | 1.1 | 0.7 | 0.6 | Light breeze |
| 1.4 | 5 | 3.1 | 2.7 | Walking pace |
| 6.9 | 25 | 15.5 | 13.5 | Cycling |
| 13.9 | 50 | 31.1 | 27.0 | Urban speed limit |
| 27.8 | 100 | 62.1 | 54.0 | Highway speed |
| 88.5 | 318.6 | 198.0 | 172.1 | SR-71 Mach 3 |
| 343 | 1235 | 767 | 666 | Speed of sound (Mach 1) |