Stopping Distance Calculator

Estimate reaction and braking distance at speed (educational).

Inputs

Results

Stopping Distance

44.8 m (147 ft)

How to use this calculator
  1. 1Enter speed in km/h.
  2. 2Set reaction time (1.5s average alert driver; 2+ if distracted).
  3. 3Double the distance in wet or icy conditions.
Pro tips
  • Educational only — always follow local traffic laws and conditions.
Frequently Asked Questions
How to Use

About the Stopping Distance Calculator

What it calculates

Estimates total stopping distance combining reaction distance and braking distance at a given speed.

When to use it

Educational tool for understanding safe following distances — not for forensic accident analysis.

Formula

Reaction distance = speed × reaction time; braking distance = v² ÷ (2 × deceleration).

Example

60 km/h with 1.5s reaction → ~25m reaction + ~24m braking ≈ 49m total.

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