You can use the KidsHealth BMI calculator below to. Breathe out naturally before taking the measurement. Body mass index (BMI) is a calculation that uses height and weight to estimate how much body fat someone has.Wrap a tape measure around your waist midway between these points.Find the bottom of your ribs and the top of your hips (just above your belly button).Use measurements in the same units (for example, centimetres or inches).Ī waist to height ratio of 0.5 or higher means you may have increased health risks such as heart disease, type 2 diabetes and stroke. To calculate your waist to height ratio, measure your waist and divide it by your height. Measuring your waist to height ratio can tell you if you have excess tummy fat, even if you have a healthy BMI. You may want to see a GP for help and advice. If you want to lose weight, you can find more information at NHS Better Health. Healthy weightįind out more about having a balanced diet and find fitness videos you can try at home to maintain a healthy weight. If you have an eating disorder, the BMI calculation results do not apply. BMI weight ranges Underweightīeing underweight could be a sign you're not eating enough or you may be ill. This means muscular adults and athletes may be classed as overweight or obese even though their body fat is low.Īdults who lose muscle as they get older may fall into the healthy weight range even though they may be carrying excess fat. The BMI calculation does not include muscle mass, which weighs more than fat. If you're concerned about your child's weight, see a GP.īlack, Asian and other minority ethnic groups have a higher risk of developing some long-term conditions, such as type 2 diabetes. are under 18 years old – children and young people’s weight is measured in centiles based on an average from national surveys.Use your pre-pregnancy weight when calculating your BMI. are pregnant – your BMI will go up as your weight increases during pregnancy.have an eating disorder – please get further advice from a GP.The BMI calculation is not suitable if you: The BMI calculation divides an adult's weight in kilograms (kg) by their height in metres (m) squared.įor example, an adult who weighs 70 kg (around 11 stone) and whose height is 1.75 m will have a BMI of 22.9. But what does it mean, and why is it important to your childs health. If you're concerned about your weight, or the weight of someone you care for, speak to a GP. You may hear the term body mass index or 'BMI' during your childs checkups, or even at your own health visits. The BMI healthy weight calculator is being updated and is temporarily unavailable. Changes to the BMI healthy weight calculator
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