The Body Mass Index (BMI), also known as the Quetelet Index, is a statistical measurement of an individual's weight to height. The BMI does not measure body fat, but it does help to estimate an ideal body weight based on height. Invented between 1830 and 1850 by Adolphe Quetelet, the BMI measurement is the most widely used calculation to identify weight problems which include underweight, overweight, and obesity. Use the BMI calculator to your left to determine your BMI now!