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.
Keep up the good work! For tips on maintaining a healthy weight, check out the food and diet and fitness sections.
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.
The best way to lose weight if you're obese is through a combination of diet and exercise, and, in some cases, medicines.