Caculating your Body Mass Index (BMI)

Weighing scales

Body mass index or BMI is often used to provide a simple calculation as to whether you need to lose weight.

By calculating your height and weight you can tell how healthy your weight is. When using our BMI calculator below please please in mind that:

  • It may overestimate body fat if your athletic or have a muscular build
  • It may underestimate body fat if your an older person and have lost muscle mass

How to Calculate your BMI

If you know your height and weight, you can work out which weight range you're in using the simple steps outlined below:



Please note: A BMI measurement is not as accurate if you're an athlete or very muscular (muscle weighs more than fat) as this can push you into a higher BMI category even if you have a healthy level of body fat. It's also not accurate for women who are pregnant or breastfeeding, or people who are frail.

None of the information has been reviewed or endorsed by any scientific or medical experts as the information on our site relating to specific products is purely descriptive in nature. The information provided on this site is of a general nature only and is not meant to replace the advice of your doctor or pharmacist. Please contact your healthcare provider for advice for your specific health or medical needs. Remember, healthy eating and regular exercise is still the best way to lose weight.