Understand your body composition
Lean Body Mass Calculator
Estimate how much of your body weight is lean mass using your weight and body-fat estimate.
Estimate your lean mass
Tell us what you’re working with
Enter the measurements used by the calculator to estimate your lean body mass.
Estimated Lean Body Mass
Derived from your body-fat estimate; this is not a direct tissue measurement.
Your lean body mass result is ready.
Lean mass is not the same as muscle mass
This two-compartment estimate subtracts calculated fat mass from total body weight. The remainder includes muscle, water, bone, organs, and other non-fat tissue.
Limits of the estimate
Any error in body-fat percentage carries directly into lean mass. FitCalc therefore requires a body-fat estimate rather than substituting a height-and-weight prediction that answers a different question.