underweight – on the 2nd centile or below.The BMI calculator works out if a child or young person is: Overweight children are thought to be at increased risk of a variety of health conditions, and they're also more likely to be overweight as adults. You're at very high risk and should contact a GP if your waist is:įor children and young people aged 2 to 18, the BMI calculator takes into account age and gender as well as height and weight. Regardless of your height or BMI, you should try to lose weight if your waist is: Breathe out naturally before taking the measurement.Wrap a tape measure around your waist midway between these points.Find the bottom of your ribs and the top of your hips.You can have a healthy BMI and still have excess tummy fat, meaning you're still at risk of developing these conditions. Measuring your waist is a good way to check you're not carrying too much fat around your stomach, which can raise your risk of heart disease, type 2 diabetes and stroke. Black, Asian and other minority ethnic groupsīlack, Asian and other minority ethnic groups have a higher risk of developing some long-term (chronic) conditions, such as type 2 diabetes. The best way to lose weight if you're obese is through a combination of diet and exercise, and, in some cases, medicines. 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 overweight is through a combination of diet and exercise. Keep up the good work! For tips on maintaining a healthy weight, check out the food and diet and fitness sections. If you're underweight, a GP can help.įind out more in underweight adults Healthy weight Understanding your BMI result Underweightīeing underweight could be a sign you're not eating enough or you may be ill.

Bmi and bmr calculator