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.

Kilometres per hour per second (km/h/s)
Feet per second squared (ft/s²)

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/s0.911344 ft/s²
2 km/h/s1.82269 ft/s²
5 km/h/s4.55672 ft/s²
10 km/h/s9.11344 ft/s²
25 km/h/s22.7836 ft/s²
50 km/h/s45.5672 ft/s²
100 km/h/s91.1344 ft/s²

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