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Lean Body Mass Calculator

Calculate your Lean Body Mass (LBM)—your total weight excluding fat tissue—using the Boer, James, and Hume clinical formulas.

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Understanding Your Result

The calculation generated by this tool provides an evidence-based assessment derived from established physiological and clinical equations. Use this measurement as an educational indicator alongside broader lifestyle variables, including overall dietary quality, resistance training, cardiovascular endurance, and routine medical checkups.

Mathematical Formula & Scientific Methodology

Boer Formula (Men: LBM = 0.407W + 0.267H - 19.2; Women: LBM = 0.252W + 0.473H - 48.3) where W is weight in kg and H is height in cm.

\text{Boer (Male)}: \text{LBM} = (0.407 \times W) + (0.267 \times H) - 19.2

Step-by-Step Example Calculation

For a male weighing 75 kg and 180 cm: LBM = (0.407 × 75) + (0.267 × 180) - 19.2 = 30.525 + 48.06 - 19.2 = 59.39 kg of lean mass.

Clinical Limitations & Nuances

These equations estimate fat-free mass from external height and weight and may underestimate lean mass in competitive strength athletes.

Frequently Asked Questions

What constitutes Lean Body Mass?

Lean body mass consists of muscle tissue, bones, organs, water, connective tissue, and essential structural lipids—everything except storage adipose tissue.

How does knowing LBM help my fitness programming?

Calculating nutrition and protein targets relative to LBM (e.g. 2.2g/kg LBM) provides greater accuracy for individuals with higher body fat percentages.

Medically Reviewed Content
SM

Dr. Sarah Mitchell, MS, RD

Exercise Physiologist & Clinical Dietitian

Formulas and educational copy on Body Metric Hub are researched and verified by certified clinical nutritionists and exercise physiology specialists.

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Important Medical & Health Notice

The calculations, tools, and health articles on Body Metric Hub are provided strictly for educational and informational purposes. They do not constitute clinical diagnosis, medical advice, or treatment plans. Calculations are mathematical estimations and cannot replace individual medical evaluation by a licensed physician or registered dietitian. If you are experiencing acute medical symptoms, please contact your local emergency services immediately.