Body Mass Index (BMI)

BMI Calculator

Knowing BMI can help adult men and women understand their overall health. Use the BMI calculator below to determine your body mass index by inputting your height and weight.

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These calculations are based on averages.

Understanding Body Mass Index (BMI)

Body mass index (BMI) is a method of screening for a weight category using the ratio of your height to your weight. The BMI is a measure of overweight that is corrected for height. Knowing your BMI is a way to tell if you are at a healthy weight. The higher your BMI, the greater your risk for weight-related health problems.

What BMI means

  • BMI below 18.5: Underweight
  • BMI 18.5 to 24.9: Healthy weight or “ideal body weight”
  • BMI 25 to 29.9: Overweight
  • BMI 30 and over: Obese
  • BMI 40 and over: Severe obesity

It’s important to remember that BMI isn’t a suitable measurement for certain people, including:

  • children – there  is a separate BMI chart for monitoring BMI in children, ask your health visitor or GP if you would like more information on this
  • pregnant women
  • athletes or those who’re extremely muscular

BMI calculations don’t take into consideration your body composition (e.g muscle, fat, bone density), sex and other factors which can impact your weight. However, it’s a useful and quick way to indicate if you’re in a healthy weight range.

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