Convert Feet per second squared to Millimetres per second squared
Convert Feet per second squared (ft/s²) to Millimetres per second squared (mm/s²) instantly and accurately.
Conversion Formula
mm/s² = ft/s² × 304.8
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.
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.
Quick Reference Table
| Feet per second squared (ft/s²) | Millimetres per second squared (mm/s²) |
|---|---|
| 1 ft/s² | 304.8 mm/s² |
| 2 ft/s² | 609.6 mm/s² |
| 5 ft/s² | 1524 mm/s² |
| 10 ft/s² | 3048 mm/s² |
| 25 ft/s² | 7620 mm/s² |
| 50 ft/s² | 15240 mm/s² |
| 100 ft/s² | 30480 mm/s² |