Body composition is a component of physical fitness that refers to the body in terms of lean mass (muscle, bone, vital tissue, and organs) and fat mass. The optimal ratio of fat to lean mass is an indication of fitness, so the Army National Guard takes body composition into account when measuring a Soldier’s overall fitness level.

Body composition is different than the body mass index, or BMI, which only takes your height and weight into consideration. In some cases, very muscular individuals may have a higher BMI that falls above normal because muscle mass weighs a lot. Calculating your body composition gives you a more accurate picture of your physical fitness.

To determine your body composition, follow the instructions in the calculator. You’ll need a measuring tape to take accurate measurements.