If you know your bodyweight in pounds (lbs) and your bodyfat percentage, then enter those in the "Lean Mass Calculator" and press the Submit button.

Your lean body mass will then be transfered to the "Calorie Calculator" below where you can then select your activity level and desired goal.

If you don't know your bodyfat percentage, then you can enter your weight in pounds (lbs) in the "Calorie Calculator" and then select "Total Weight" and your "Goal"