The BFC is a tool to help a person determine their body fat percentage in complete privacy - anywhere - anytime. Body fat percentage is the actual amount of body fat a person carries, as opposed to lean mass (including bone, muscle, organ tissue, blood and everything else). This method of determining fat levels is considered more accurate than simply weighing yourself on the scale, which can give a faulty measure of fitness. Knowing your level of body fat can help you to determine if your current fitness routine is working to decrease you body fat while maintaining and increasing lean mass. Always keep in mind that when you are trying to lose "weight", what you really want is to lose "fat".