How can I work out my body mass index (BMI)?

To work out your BMI:

  • divide your weight in kilograms (kg) by your height in metres (m)
  • then divide the answer by your height again to get your BMI

For example:

  • if you weigh 70kg and you're 1.75m tall, divide 70 by 1.75 – the answer is 40
  • then divide 40 by 1.75 – the answer is 22.9
  • your BMI is 22.9kg/m2 

Try the BMI healthy weight calculator to find out your BMI and get personalised weight loss advice.

Further information:

Video: understanding BMI results in adults

An expert explains how to calculate your BMI (body mass index) and interpret the results correctly. He also discusses the health risks associated with a BMI that is too low or too high.

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Page last reviewed: 26/07/2016

Next review due: 26/07/2019