Speed and conditions
km/h
s
Enter the speed and the reaction time (typically ~1 s), then pick the road condition.
⏹Stopping distance
27.9m
Reaction distance13.9 m
Braking distance14 m
Stopping distance27.9 m
Physics estimate (tyres and brakes in good condition). Braking distance grows with the square of speed: double the speed → 4× the distance (e.g. 100→300 km/h is 9×). At very high speeds, aerodynamic drag and downforce shorten the real distance a little versus this idealised model. In reality the car, tyres and road also matter.
Stopping distance = 27.9 m