Calculate your BMI is a free application that allows us to know your body mass index (BMI) and shows you that weight level you are, just enter your height and weight. What is BMI? It is a measure of association between the mass and height of an individual designed by the Belgian statistician Adolphe Quetelet, so also known as Quetelet index. "Calculate your BMI" Features Show your BMI and weight level. Units in metric and imperial system. Change units easily. Quick & easy.