The body mass index measurement is the calculation of your body weight in relation to your height and is commonly used as an indicator of whether you might be in a risk category for health problems caused by your weight. Using a BMI calculator such as the one on this page, you enter your weight and height measurements. Those figures are entered into the BMI formula (more on that below) to produce your current BMI reading.


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BMI Formula

The official formula for BMI was devised in the 1830s by Belgian mathematician Adolphe Quetelet.

Metric BMI Formula

BMI = weight (kg) / height2 (m2)

Imperial BMI Formula

BMI = ( weight (lb) / height2 (in2) ) x 703