Caculating your Body Mass Index (BMI)

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

calculating body mass index

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 you’re 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:

To calculate the BMI, you need to divide the person’s weight in kilograms by the square of his or her height in meters (weight รท (height x height)). For example:A person who weighs 50 kilograms and is 1.7 meters tall will have a BMI of 22.1 (50/((1.7)^2))

A person who weighs 80 kilograms and is 1 pound tall will have a BMI of 28.3 (80/((1)^2))

A BMI of 18.5 means that your weight is within the healthy range and you have an appropriate amount of body fat. A BMI under 18.5 means that you are underweight, while a BMI over 25 means that you are overweight and need to lose some weight as it will have negative effects on your health.

The World Health Organization defines people with a BMI between 18.5-24.9 as having a normal weight, those with a BMI between 25-29.9 are considered overweight, and those with a BMI over 30 are considered obese.

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.

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