![]() The importance and usefulness of the index and hence any Body Mass Index calculator is in its curvilinear relationship to all-cause mortality. In general, BMI is useful when applied to adults, but may be ill-suited when used for young children or even teenagers where the waist to hip ratio and body fat estimates may be more informative. The modern term "body mass index" (BMI) was coined in a paper published in the July 1972 edition of the Journal of Chronic Diseases by Ancel Keys et al., in which it was argued that what was defined as BMI was ".if not fully satisfactory, at least as good as any other relative weight index as an indicator of relative obesity". The concept of the BMI is due to one Adolphe Quetelet - a Belgian astronomer, mathematician, statistician and sociologist and his work on "social physics" between 1830 to 1850. Our BMI calculator also requires just these two measurements as input and the output is in the units BMI is measured: kg per square meter (kg/m 2), which is often left out in both writing and speech. The simplicity of the body mass index calculation is one of its advantages: to calculate it one only needs to know his or her weight and height. Breathe out naturally before taking the measurement.Body Mass Index (BMI) is an index that attempt to quantify the amount of muscle, fat, and bone mass in an individual, and categorize them as underweight, normal weight, overweight, or obese, based on the index value.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. If you're concerned about your weight, or the weight of someone you care for, speak to a GP. The BMI healthy weight calculator is being updated and is temporarily unavailable. Changes to the BMI healthy weight calculator
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