this calculation is not acurate. It says that I would have to be 160 pounds to have a 23 BMI. If I was 160lbs I would be sickly looking. This measuremnet tool of the bmi is inacurate because this version does not take into account bone structure which plays a large part into BMI. Also it does not take into account muscle mass. These two are specifically important because bone mass and muscle mass weight more than fat. I would take this measurement tool with a grain of salt unless you have an average bone structure and not much muscle mass.