The Body Mass Index(BMI) formula was developed by Belgium statistician Adolphe Quetelet (1796-1874), and was known as the Quetelet Index. BMI is also referred to as 'body mass indicator'. BMI is an internationally used measure of obesity. Body mass index calculation is very straightforward. Calculating body mass index requires only two measurements, height & weight. Imperial BMI Formula, The imperial bmi formula accepts weight measurements in pounds & height measurements.