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Constant-Deceleration Stopping Estimate

Distance = speed×reaction time + speed²/(2×deceleration).

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Constant braking distance calculator online

Distance = speed×reaction time + speed²/(2×deceleration). Use this to calculate a stated mathematical relationship from your own explicit assumptions. Units and input order are part of the calculation; no changing external rates or laws are inferred.

How to use it

Enter 3 comma-separated numbers in this order: speed km/h, reaction time seconds, deceleration m/s². Choose Calculate. Review the output, then copy or download it.

Calculation method

Distance = speed×reaction time + speed²/(2×deceleration).

Worked examples

Use this to calculate a stated mathematical relationship from your own explicit assumptions. Units and input order are part of the calculation; no changing external rates or laws are inferred.

Reproducible worked example

Settings: No additional settings.

Input:

50, 1, 5

With the input and settings above, the tool produces:

Output:

{
  "reactionMetres": 13.88888888888889,
  "brakingMetres": 19.290123456790123,
  "totalMetres": 33.17901234567901
}

For this input, “reactionMetres” is 13.88888888888889; “brakingMetres” is 19.290123456790123; “totalMetres” is 33.17901234567901. These are the named fields in the example output.

Limitations and common mistakes

  • Ideal constant-deceleration example. Road conditions, gradients, driver response and vehicle performance are not assessed.
  • Combined input is bounded to 150,000 characters; output text is bounded to 1.2 million characters. Some algorithms impose smaller limits, stated in their error messages.
  • Use a dot as the decimal separator and commas or spaces between numeric entries. The calculation uses floating-point arithmetic unless exact integers are explicitly stated.

Frequently asked questions

What format should I enter?

Enter 3 comma-separated numbers in this order: speed km/h, reaction time seconds, deceleration m/s². The worked example shows the supported structure and actual output.

How can I approximate constant-deceleration stopping distance online?

Enter 3 comma-separated numbers in this order: speed km/h, reaction time seconds, deceleration m/s². Choose Calculate. Review the output, then copy or download it.

Where is my input processed?

The bundled tool processes input in your browser. It does not upload tool input to a conversion service. Other site plugins, analytics, advertising and browser extensions may have separate behavior.

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