Convert Foot per Second to Inch per Minute (ft/s → in/min)

Converting feet per second to inches per minute 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 720.56738

   The conversion factor from ft/s to in/min is 720.56738. Multiply your value by this number.
3. 3
   Read the result in inches per minute

   The result is your value in inches per minute (in/min).

Multiply the value in feet per second by 720.56738. For the reverse direction, multiply by 0.001388.

• ✓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 Inch per Minute?

Inches per minute is the American standard feed-rate unit for CNC machining, 3D printing, milling machines, and precision manufacturing. Machinists program tool feed rates in IPM (inches per minute) — typical values range from 5 to 100 IPM depending on material and tool. American machine controllers (Fanuc, Haas, Mazak) default to inches per minute when set to imperial mode. 3D printer feed rates are also commonly specified in IPM in US-built machines. The unit relates to inches per second (60 ipm = 1 ips), mm per minute (1 ipm = 25.4 mm/min — the metric machinist equivalent), and feet per minute (12 ipm = 1 fpm). Manufacturing CAM (computer-aided manufacturing) software allows switching between IPM and metric mm/min depending on machine controller setup.

• CNC milling and turning feed rates
• 3D printer head movement
• Some US industrial flow specifications