Convert Millimetres per second squared to Feet per second squared
Convert Millimetres per second squared (mm/s²) to Feet per second squared (ft/s²) instantly and accurately.
Conversion Formula
ft/s² = mm/s² × 0.003280839895
About Millimetres per second squared
The millimetre per second squared (mm/s²) equals 10⁻³ m/s², the standard unit for vibration acceleration in machine condition monitoring. ISO 10816 and ISO 20816 define machinery vibration limits in mm/s and mm/s²; ISO 10816-3 Zone A boundary for industrial machinery is ≈32 mm/s² at 2.2 Hz. Seismically, MMI VI ground shaking (masonry damage threshold) corresponds to 620-1250 mm/s² peak ground acceleration. 1 mm/s² = 10⁻³ m/s² ≈ 1.02 × 10⁻⁴ g₀.
About Feet per second squared
The foot per second squared (ft/s²) equals exactly 0.3048 m/s², the coherent acceleration unit in the imperial engineering system where F [lbf] = m [slug] × a [ft/s²]. Standard gravity is g₀ = 32.174 ft/s², a constant used throughout US aerospace and structural engineering - from legacy NACA reports to modern software (SAP2000, ETABS with US units). A car braking at 0.8 g decelerates at about 25.7 ft/s². 1 ft/s² = 0.3048 m/s² ≈ 3.108 × 10⁻² g₀.
Quick Reference Table
| Millimetres per second squared (mm/s²) | Feet per second squared (ft/s²) |
|---|---|
| 1 mm/s² | 0.00328084 ft/s² |
| 2 mm/s² | 0.00656168 ft/s² |
| 5 mm/s² | 0.0164042 ft/s² |
| 10 mm/s² | 0.0328084 ft/s² |
| 25 mm/s² | 0.082021 ft/s² |
| 50 mm/s² | 0.164042 ft/s² |
| 100 mm/s² | 0.328084 ft/s² |