Body Mass Index Calculator

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Body mass index (BMI) uses measurements of a person's height and weight to give an indication of a person's healthy weight range. Though BMI does not actually calculate the percentage of body fat, it is one of the most widely used tools to diagnose weight problems.

BMI is calculated by dividing the person's weight (in kg) by their height (in meters) squared.

To use the calculator, enter your height and weight, select the appropriate units and click Calculate

Height:     m
feet ' inches  (e.g. 5'6 or 5, 6)
Weight kg
stone, pounds

This calculator may not be valid for:

  • Athletes or other people with higher than average percentage of muscle tissue.
  • children
  • pregnant women

This calculator is provided for general information only and should not be treated as a substitute for professional medical advice.

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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