BMI (Body Mass Index)Your healthy weight range is based on a measurement known as the Body Mass Index (BMI). To calculate your BMI, all you need to know is your height and weight. Complete the fields below and click calculate to find out what your BMI score is.
BMI Calculator
What your BMI Score Means
| Body Mass Index (kg/m²) |
Weight Classification |
| Less than 20 |
Underweight |
| 21-25 |
Desirable or healthy range |
| 26-30 |
Overweight |
| 31-35 |
Obese (Class I) |
| 36-40 |
Obese (Class II) |
| Over 40 |
Morbidly or severely obese (Class III) |
| Source: World Health Organisation |
The following graph gives you a guide in inches/pounds: 
Top Tip"The BMI formula applies to 'normal' healthy adults. Make allowances for gender and slight or stocky build. It is not appropriate for pregnant women, children or in some medical conditions."
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