Body Mass Index Calculator
The size of your waist (regardless of your height) provides a good indication of your risk of developing chronic diseases such as diabetes, heart disease and some cancers.
The World Health Organization defines the following cut points for waist circumference in Caucasians. These figures may vary slightly within different ethnic groups.
Men: more than 94 centimetres
Women: more than 80 centimetres
Greatly increased risk
Men: more than 102 centimetres
Women: more than 88 centimetres
Body Mass Index, or BMI, is a simple index of weight-for-height that is commonly used to classify underweight, overweight and obesity in adults. It is defined as the weight in kilograms divided by the square of the height in metres (kg/m squared).
BMI = weight (kg) / height (m) x height (m)
The classification of overweight and obesity, according to BMI, is shown in the table above. This applies to men and women over the age of 18.
BMI AND HEALTH
People who are overweight or obese (i.e. a higher BMI), have a greater chance of developing many diseases, such as Heart Disease, diabetes, high blood pressure, and several types of cancer.
BMI AND BODY FAT
BMI does not measure body fat, and cannot differentiate between body fat and muscle mass. People who have the same BMI can have a different percent body fat. For example, a bodybuilder with a large muscle mass and a low percent body fat may have the same BMI as a person who has more body fat, because BMI is calculated using height and weight only.
BMI IN CHILDREN
In adults, BMI changes very little with age. However, in children, BMI changes substantially with age. Therefore, child BMI needs to be assessed using BMI-for-age charts, where the child's BMI is plotted against their age. This will indicate whether the child is underweight, in the normal range, overweight or obese.
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