Acceleration Calculator
Acceleration from a change in velocity, plus g-force and distance covered.
The formulas
a = (v - u) / t v² = u² + 2a(x - x₀)
Acceleration is the rate of change of velocity. 0 to 100 km/h (27.8 m/s) in 6 seconds is 4.63 m/s², about 0.47 g. The second form skips time entirely: useful when you know the distance instead, like braking distances.
Reference points
Free fall is 1 g (9.81 m/s²). A hard car brake is about 0.8 g, a fighter turn 9 g, and a smartphone drop hitting concrete spikes into the hundreds of g for a millisecond. Negative results just mean deceleration.