How it works
Lean body mass (LBM) includes muscle, bone, organs and water. Knowing your LBM helps set protein targets and track whether weight loss comes from fat or muscle. We use the Boer formula, one of the most widely used estimates.
Frequently asked questions
Why does lean body mass matter?
Muscle drives your metabolism and strength. Losing fat while keeping LBM is the goal of a good transformation.
How can I increase lean body mass?
Strength training 3–4 times a week and eating enough protein (about 1.6 g per kg of body weight).
These calculators give estimates for general guidance only and are not medical advice. Please consult a doctor for health concerns.