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Physics

Constant Deceleration Stopping Distance Calculator

Calculate ideal braking distance for a constant deceleration.

SI units shown beside each fieldIdeal model explained below

Physical quantities

Runs on your device

CALCULATED QUANTITY

Your result

Let’s calculate.

Use the Calculate button to see your result.

Review the method below for assumptions and conventions.

How to use this tool

  1. Enter initial speed, deceleration magnitude.
  2. Select Calculate to view the result.
  3. Check the method and assumptions below before using the result.

The method, explained

Stopping distance = speed²/(2 × deceleration).

A WORKED EXAMPLE

Using initial speed = 20 m/s, deceleration magnitude = 5 m/s², the result is 40 m. Change these example inputs to match your task; use the method above to check each step.

What to keep in mind

Excludes reaction time, tire grip changes and road slope. Not a safe driving-distance recommendation. An idealized educational model using the stated SI units. Real systems may need additional forces, losses or experimental measurements. Not a safety or equipment specification.

Common questions

Which inputs does this calculation need?

Calculate ideal braking distance for a constant deceleration. Enter initial speed in m/s, deceleration magnitude in m/s². The filled example is editable and is not a saved personal record.

How should I interpret the result?

Excludes reaction time, tire grip changes and road slope. Not a safe driving-distance recommendation. An idealized educational model using the stated SI units. Real systems may need additional forces, losses or experimental measurements. Not a safety or equipment specification.

Methodology maintained by ClarityKit. How these tools are built and checked.