Convert Feet per Second to Speed of Light
Convert Feet per Second (ft/s) to Speed of Light (c) instantly and accurately.
Conversion Formula
c = ft/s × 1.016703362e-9
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 Speed of Light
The speed of light in vacuum (c) = exactly 299,792,458 m/s - the defined SI constant from which the metre is derived (since 1983) and the universal speed limit of causality. Light from the Sun reaches Earth in 8 min 20 s; from the Moon in 1.28 s; from Proxima Centauri in 4.24 years. Mars communication delay 3-22 minutes. In optical fibre (n ≈ 1.467), c/n ≈ 200,000 km/s. GPS clocks must correct for both special and general relativistic effects. c = 299,792,458 m/s.
Quick Reference Table
| Feet per Second (ft/s) | Speed of Light (c) |
|---|---|
| 1 ft/s | 1.017 × 10-9 c |
| 2 ft/s | 2.033 × 10-9 c |
| 5 ft/s | 5.084 × 10-9 c |
| 10 ft/s | 1.017 × 10-8 c |
| 25 ft/s | 2.542 × 10-8 c |
| 50 ft/s | 5.084 × 10-8 c |
| 100 ft/s | 1.017 × 10-7 c |