Tools / Stopping distance calculator
Stopping distance calculator
Enter your speed. You get the German driving-school rules of thumb and a physics estimate for the road condition.
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How to use it
- Enter the speed in km/h.
- Choose the road condition.
- Compare the rules of thumb with the physics estimate.
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Last checked: October 2026 · Based on: German driving-school rules of thumb. Found a mistake? Use the form below – we fix confirmed errors and update the date.
Frequently asked questions
What is the stopping distance at 50 km/h?
Rule of thumb: 15 m reaction + 25 m braking = 40 m; with emergency braking about 27.5 m.
How much longer is the braking distance at double speed?
Four times – braking distance grows with the square of the speed.