BMI Calculator

Use this calculator to check your body mass index (BMI) and find out if you're a healthy weight. Or you can use it to check your child's BMI.

Understanding your BMI resultUnderweight

Being underweight could be a sign you're not eating enough or you may be ill.

Healthy weight

Keep up the good work! For tips on maintaining a healthy weight, check out the food and diet and fitness sections.

Overweight

The best way to lose weight if you're overweight is through a combination of diet and exercise.

The BMI calculator will give you a personal calorie allowance to help you achieve a healthy weight safely.

Obese

The best way to lose weight if you're obese is through a combination of diet and exercise, and, in some cases, medicines.