Car Stopping Distance Calculator

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The calculator below estimates the stopping distance for a well maintained car with an alert driver on a dry road. Obviously actual stopping distances will vary considerably depending on condition of the road and car as well as the alertness of the driver

Enter the car's speed in either miles or kilometers per hour and the stopping distance will be calculated.

Speed miles per hour
km per hour
Thinking Time
Thinking time used in The Highway Code   
Custom time  seconds

Thinking Distance feetThis is the distance the car travels in the time it takes the driver to see the hazard, decide to brake and actually apply the brakes and is directly proportional to speed.
Braking Distance feetThis is the distance the car travels while the brakes are applied and is proportional to speed squared.
Total Stopping Distance feet 

This calculator is based on interpolating or extrapolating the stopping distance data from the British highway code which can be found here.

Whilst I try to keep the information on this site accurate, I'm only human and I do occasionally make mistakes. I therefore advise you to check any information before using it for anything important. If you do find any errors, please let me know so that I can correct them.

Click here to report an error on this page.

This page was last changed on: 02 August 2021.

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