Convert Feet per second squared to Kilometres per hour per second

Convert Feet per second squared (ft/s²) to Kilometres per hour per second (km/h/s) instantly and accurately.

Conversion Formula

km/h/s = ft/s² × 1.09728

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 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.

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