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:

Understanding BMI results in adults

Find out how to calculate your body mass index (BMI) and interpret the results correctly.

Media last reviewed: 20/01/2018

Next review due: 20/01/2021

Page last reviewed: 26/07/2016

Next review due: 26/07/2019