Stopping Distance Calculator

Find total stopping distance from speed and braking.

Speed

Reaction time

Braking deceleration (m/s²)

Total stopping distance 69.643

Reaction distance 25

Braking distance 44.643

Formula: total = v·t_reaction + v² ÷ (2·deceleration)

Step-by-step with your numbers:

1. Values used:

2. Speed = 25

3. Reaction time = 1

4. Braking deceleration = 7 m/s²

6. Total stopping distance = 69.643

7. Reaction distance = Speed x Reaction time = 25 x 1 = 25

8. Braking distance = 44.643

Did we solve your problem today?

Total stopping distance is reaction distance plus braking distance.

The math behind it

reaction distance = speed × reaction time; braking distance = speed² ÷ (2 × deceleration).

25 m/s, 1 s reaction, 7 m/s² → ~69.6 m.

Why speed² matters?

Braking distance grows with the square of speed — double the speed, quadruple the distance.