Convert Kilometres per hour per second to Feet per second squared
Convert Kilometres per hour per second (km/h/s) to Feet per second squared (ft/s²) instantly and accurately.
Conversion Formula
ft/s² = km/h/s × 0.9113444153
About Kilometres per hour per second
The kilometre per hour per second (km/h/s) equals 1/3.6 m/s² ≈ 0.2778 m/s², the most intuitive acceleration unit for vehicle performance in countries using km/h. A 0-100 km/h time of 6.3 s (VW Golf GTI) gives a mean acceleration of 15.9 km/h/s ≈ 4.4 m/s²; a 2.6 s EV sprint corresponds to 38.5 km/h/s ≈ 10.7 m/s². Railway standards (EU TSI, JIS) use km/h/s: high-speed trains launch at 2.5-4 km/h/s; emergency braking must reach at least 9.0 km/h/s. 1 km/h/s = 1/3.6 m/s² ≈ 2.83 × 10⁻² 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
| Kilometres per hour per second (km/h/s) | Feet per second squared (ft/s²) |
|---|---|
| 1 km/h/s | 0.911344 ft/s² |
| 2 km/h/s | 1.82269 ft/s² |
| 5 km/h/s | 4.55672 ft/s² |
| 10 km/h/s | 9.11344 ft/s² |
| 25 km/h/s | 22.7836 ft/s² |
| 50 km/h/s | 45.5672 ft/s² |
| 100 km/h/s | 91.1344 ft/s² |