Convert Feet per Second to Millimetres per Second
Convert Feet per Second (ft/s) to Millimetres per Second (mm/s) instantly and accurately.
Conversion Formula
mm/s = ft/s × 304.8
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 Millimetres per Second
A millimetre per second (mm/s) is 10⁻³ m/s - the speed of slow industrial mechanisms and recognisable biological motion. FDM 3D printers move at 40-120 mm/s for perimeters and 150-300 mm/s for infill. Garden snails travel 0.5-1.5 mm/s; earthworms 3-5 mm/s. CNC finishing operations run 1-several hundred mm/s. Hydraulic precision slides work at mm/s for surface preparation. Ultrasound particle velocities in soft tissue are also in this range. 1 mm/s = 10⁻³ m/s.
Quick Reference Table
| Feet per Second (ft/s) | Millimetres per Second (mm/s) |
|---|---|
| 1 ft/s | 304.8 mm/s |
| 2 ft/s | 609.6 mm/s |
| 5 ft/s | 1524 mm/s |
| 10 ft/s | 3048 mm/s |
| 25 ft/s | 7620 mm/s |
| 50 ft/s | 15240 mm/s |
| 100 ft/s | 30480 mm/s |