Convert Foot per Second to Mile per Hour (ft/s → mph)

Converting feet per second to miles per hour is straightforward: multiply by the conversion factor. Follow these three steps to do it by hand or in your head.

1. 1
   Take your value in feet per second

   Start with the number of feet per second (ft/s) you want to convert.
2. 2
   Multiply by 0.681818

   The conversion factor from ft/s to mph is 0.681818. Multiply your value by this number.
3. 3
   Read the result in miles per hour

   The result is your value in miles per hour (mph).

Multiply the value in feet per second by 0.681818. For the reverse direction, multiply by 1.466667.

• ✓1 ft/s = 0.3048 m/s = 1.097 km/h = 0.682 mph.
• ✓Multiplying ft/s by 0.682 gives mph.
• ✓US engineering often uses ft/s; metric countries use m/s.

• ✗Confusing ft/s with fps (frames per second in video/gaming).
• ✗Mixing ft/s with mph without conversion.
• ✗Using ft/s instead of m/s in international scientific contexts.

What is the Foot per Second?

Feet per second is the standard ballistics unit for projectile speeds, American sports analytics, and engineering. Bullet velocities are universally given in fps: a .22 LR bullet flies at about 1,200 fps, a 9 mm pistol round at 1,150 fps, and a high-velocity rifle round at 3,000 fps. American football and baseball analytics increasingly use fps for measuring throwing speed, ball exit velocity, and player movement. Engineering disciplines that retain US customary units (HVAC, civil engineering) often specify air or water flow speeds in fps. The unit relates to mph (1.467 fps = 1 mph), m/s (1 fps ≈ 0.305 m/s), and the knot (1 fps ≈ 0.592 kn). Outside ballistics and US sports, m/s and km/h dominate — but in their domains, fps remains entrenched in American technical practice.

• US ballistics and firearms
• US civil-engineering flow rates
• Older US physics and engineering texts

What is the Mile per Hour?

Miles per hour is the road-speed standard in the United States, the United Kingdom, and several Caribbean countries. American and British road signs, car speedometers, and weather reports use mph. Typical US speed limits are 25 mph (residential), 35–45 mph (urban arterials), 55–65 mph (rural highways), and 65–80 mph (interstates). The UK uses mph despite metric measurement elsewhere — a result of incomplete metrication. Mph derives from the mile (distance) and hour (time): 1 mph ≈ 1.609 km/h ≈ 0.447 m/s. World-class sprinters reach about 27 mph, professional baseball pitchers throw at 90–105 mph, and commercial airliners cruise at 550–600 mph. The unit relates to km/h (1 mph ≈ 1.609 km/h), m/s (1 mph ≈ 0.447 m/s), the knot (1 mph ≈ 0.869 kn), and ft/s (1 mph ≈ 1.467 fps).

• US and UK road speed limits
• US car speedometers
• US baseball pitch speeds