Stopping Distance Calculator
SI
Imp
Imperial
Inputs
View results
Initial speed
(v_0)
Vehicle speed before braking.
mph
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
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Total stopping distance
282.4
ft
Pass
Also computed
Braking distance
150.4
ft
Reaction distance
132
ft
Braking time
3.42
s
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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