PLEASE NOTE: The BMI does not actually measure the percentage of body fat and is simply defined as the individual's body weight divided by the square of his or her height. The medical establishment has generally acknowledged some major shortcomings of BMI calculation. Because the BMI formula depends only upon weight and height, its assumptions about the distribution between lean muscle mass and fatty tissue are not always exact. BMI sometimes overestimates adiposity (fat) on those with more lean body mass (e.g. muscular athletes) while greatly under-estimating excess adiposity on those with less lean body mass. For this very reason we have included in our calculator extra information which slightly adjusts your BMI. Our calculations may still not 100% accurately reflect your ideal body weight, but are certainly better then relying on a standard BMI calculation alone. More detailed goal setting instructions can be found within the Ultimate Herbal SLIM user guide which comes with the Ultimate Herbal SLIM.