Convert Feet per Second to Miles per Second
Convert Feet per Second (ft/s) to Miles per Second (mi/s) instantly and accurately.
Conversion Formula
mi/s = ft/s × 0.0001893939394
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 Miles per Second
A mile per second (mi/s) = exactly 1,609.344 m/s - above the fastest air-breathing aircraft. NASA X-43A scramjet: 2.9 km/s ≈ 1.8 mi/s (Mach 9.6). Earth's orbital speed around the Sun: ~18.5 mi/s (29.8 km/s). Light travels ~186,282 mi/s in vacuum - the classic imperial figure still used in popular astronomy. Tunguska impactor entered Earth's atmosphere at ~9-11 mi/s. 1 mi/s = 3,600 mph = 3,128.3 kn.
Quick Reference Table
| Feet per Second (ft/s) | Miles per Second (mi/s) |
|---|---|
| 1 ft/s | 0.000189394 mi/s |
| 2 ft/s | 0.000378788 mi/s |
| 5 ft/s | 0.00094697 mi/s |
| 10 ft/s | 0.00189394 mi/s |
| 25 ft/s | 0.00473485 mi/s |
| 50 ft/s | 0.0094697 mi/s |
| 100 ft/s | 0.0189394 mi/s |