» Body Mass Index

Initial Data



Body Mass Index (BMI)
New Body Mass Index (new BMI)

Body Mass Index

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.

CategoryBMI range
Starving< 16
Underweight16 - 18.5
Normal18.6 - 25
Overweight25.1 - 30
Obese30.1 - 35
Clinically Obese35.1 - 40
Morbidly Obese> 40.1