Speed unit conversion
Road signs and aviation/marine instruments often use different units.
| From | To | Multiply by |
|---|---|---|
| 1 km/h | mph | 0.621371 |
| 1 mph | km/h | 1.609344 |
| 1 m/s | km/h | 3.6 |
| 1 km/h | m/s | 0.277778 |
| 1 knot (kn) | km/h | 1.852 |
| 1 knot (kn) | mph | 1.15078 |
| 1 mph | m/s | 0.44704 |
| 1 Mach (approx sea level) | m/s | ≈340 |
Notes
- Mach depends on temperature and altitude; the row is a rough sea-level hint only.
- 1 knot = 1 nautical mile per hour.