Convert Kilometres per hour per second to Metres per second squared

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

Conversion Formula

m/s² = km/h/s × 0.2777777778

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 Metres per second squared

The metre per second squared (m/s²) is the SI coherent derived unit of acceleration, defined as Δv/Δt (m/s per s). It makes Newton's second law F = ma dimensionally consistent with the newton (1 N = 1 kg·m/s²). Key reference values: standard gravity g₀ = 9.80665 m/s² (exact); ISS centripetal acceleration ≈ 8.68 m/s²; Falcon 9 max axial load ≈ 49 m/s² (5 g₀); human tolerance limit for sustained acceleration ≈ 30 m/s². All SI engineering and simulation software uses m/s² as the native acceleration unit. 1 m/s² = 100 Gal ≈ 0.102 g₀ ≈ 3.281 ft/s².

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