The Body Mass Index

The body mass index (BMI), or Quetelet index, is a measure of relative weight based on an individual’s mass and height.

Devised between 1830 and 1850 by the Belgian polymath Adolphe Quetelet during the course of developing “social physics”,[2] it is defined as the individual’s body mass divided by the square of their height – with the value universally being given in units of kg/m2.


Body Mass Index Chart - Feet and Pounds

BMI Table WHO:

Meaning BMI
Normal weight 19–24,9
Overweight 25–29,9
Obesity level I 30–34,9
Obesity level II 35–39,9
Obesity level III ≥ 40

Source: BMI Table