Convert Inch per Minute to Foot per Second (in/min → ft/s)
Inches per minute is the American standard for CNC machining feed rates, 3D printer speeds, and manufacturing.
Inch per Minute to Foot per Second Conversion Table
10 common values| Inch per Minute | Foot per Second |
|---|---|
| 1 in/min | 0.001388 ft/s |
| 5 in/min | 0.006939 ft/s |
| 10 in/min | 0.013878 ft/s |
| 25 in/min | 0.034695 ft/s |
| 50 in/min | 0.06939 ft/s |
| 100 in/min | 0.13878 ft/s |
| 150 in/min | 0.208169 ft/s |
| 200 in/min | 0.277559 ft/s |
| 300 in/min | 0.416339 ft/s |
| 500 in/min | 0.693898 ft/s |
How to Convert Inch per Minute to Foot per Second Manually
Step by StepConverting inches per minute to feet per second is straightforward: multiply by the conversion factor. Follow these three steps to do it by hand or in your head.
- 1Take your value in inches per minuteStart with the number of inches per minute (in/min) you want to convert.
- 2Multiply by 0.001388The conversion factor from in/min to ft/s is 0.001388. Multiply your value by this number.
- 3Read the result in feet per secondThe result is your value in feet per second (ft/s).
Formula
Multiply the value in inches per minute by 0.001388. For the reverse direction, multiply by 720.56738.
ft/s = in/min × 0.001388in/min = ft/s × 720.56738Tips
Use these in everyday conversions- 1 in/min = 0.000423 m/s = 0.0254 m/min.
- CNC: lower in/min for harder materials; higher for softer.
- Always match tool speed and material — too fast breaks bits.
Common Mistakes
Avoid these- Using mm/min and in/min interchangeably in CNC — 25.4× difference.
- Treating 100 in/min as fast — only moderate in CNC.
- Confusing feed rate with spindle RPM.
About Inch per Minute and Foot per Second
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
CNC aluminum cut: 20–60 in/min. 3D printer travel: 60–200 in/min. Plant growth: fractions of in/min × time.
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
9mm bullet muzzle velocity: ~1150 ft/s. .308 rifle: ~2700 ft/s. Free fall terminal velocity: ~195 ft/s.