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.
Estimated Lean Body Mass
Derived from your body-fat estimate; this is not a direct tissue measurement.
Your lean body mass result is ready.
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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.