Stopping Distance Calculator

Inputs

Initial speed (v_0)

Vehicle speed before braking.

km/h

Reaction time (t_r)

Driver or system delay before braking begins.

s

Braking deceleration (a)

Average braking deceleration as a fraction of g.

g

Results

Default result

Total stopping distance

86.09m

Pass

Also computed

Braking distance45.85m

Reaction distance40.23m

Braking time3.42s

Method notes 2 notes

Braking distance uses constant average deceleration. Tire grip, grade, ABS calibration, surface condition, brake fade and load change the real stop.
Reaction distance is included separately because it can dominate normal-road stopping distance.

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