The body mass index (BMI), or Quetelet index, is a statistical measure based on a person's weight and height. It is used to estimate a healthy body weight.
The body mass index (BMI) is calculated with the following formula: BMI = weight(kg) / height(m)2. If pounds and inches are used, a conversion factor of 703 (kg/m2)/(lb/in<2) must be applied.
The new BMI. In 2013 Lloyd N. Trefethen, professor of University of Oxford, proposed a new formula to calculate the BMI of a person: BMI = 1.3 x weight / height2.5. The same conversion factor applies for pounds and inches.