Convert Feet per Second to Kilometres per Second
Convert Feet per Second (ft/s) to Kilometres per Second (km/s) instantly and accurately.
Conversion Formula
km/s = ft/s × 0.0003048
About Feet per Second
A foot per second (ft/s) = exactly 0.3048 m/s - the primary speed unit in US ballistics, hydraulics, and gas dynamics. .308 Winchester muzzle velocity ~2,750 ft/s; 9mm pistol 1,200-1,400 ft/s; .50 BMG 2,910 ft/s. Speed of sound at sea level 1,116 ft/s. River channel mean velocities 0.5-6 ft/s; NFPA sprinkler pipe flows also in ft/s. 1 ft/s = 0.3048 m/s = 1.09728 km/h = 60 ft/min.
About Kilometres per Second
A kilometre per second (km/s) = 1,000 m/s - the scale of orbital mechanics and hypervelocity. ISS orbital speed ≈ 7.66 km/s; Earth escape velocity 11.186 km/s. Voyager 1 travels ~17 km/s relative to the Sun. Meteoroids enter Earth's atmosphere at 11-72 km/s; solar wind 400-800 km/s. High-explosive detonation fronts propagate at 6.9-8.8 km/s. 1 km/s = 3,600 km/h = 2,236.9 mph.
Quick Reference Table
| Feet per Second (ft/s) | Kilometres per Second (km/s) |
|---|---|
| 1 ft/s | 0.0003048 km/s |
| 2 ft/s | 0.0006096 km/s |
| 5 ft/s | 0.001524 km/s |
| 10 ft/s | 0.003048 km/s |
| 25 ft/s | 0.00762 km/s |
| 50 ft/s | 0.01524 km/s |
| 100 ft/s | 0.03048 km/s |