Convert Feet per Second to Miles per Hour
Convert Feet per Second (ft/s) to Miles per Hour (mph) instantly and accurately.
Conversion Formula
mph = ft/s × 0.6818181818
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 Hour
A mile per hour (mph) = exactly 0.44704 m/s - the primary road speed unit in the US, UK, and a few other countries. US interstate limits 65-85 mph; UK motorway 70 mph. Walking ~3-4 mph; club cycling 20-25 mph. MLB elite fastball 100 mph (44.7 m/s). Saffir-Simpson Category 5 hurricane ≥157 mph. Boeing 737 MAX cruises at ~521 mph (Mach 0.79). 1 mph = 0.44704 m/s = 1.60934 km/h = 0.86898 kn.
Quick Reference Table
| Feet per Second (ft/s) | Miles per Hour (mph) |
|---|---|
| 1 ft/s | 0.681818 mph |
| 2 ft/s | 1.36364 mph |
| 5 ft/s | 3.40909 mph |
| 10 ft/s | 6.81818 mph |
| 25 ft/s | 17.0455 mph |
| 50 ft/s | 34.0909 mph |
| 100 ft/s | 68.1818 mph |