Lean Body Mass Calculator (Boer, James & Hume Formulas
Lean Body Mass (LBM) is total body weight minus fat mass. It includes muscles, bones, organs, and water.
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What This Means For You
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📐 Formula
💡 Practical Example
Male, 80 kg, 178 cm: Boer LBM = 0.407×80 + 0.267×178 - 19.2 = 65.2 kg | James = 63.7 kg | Hume = 63.9 kg. Estimated fat mass ≈ 15.5 kg.
📖 About Lean Body Mass Calculator (Boer, James & Hume Formulas
Lean Body Mass (LBM) is total body weight minus fat mass. It includes muscles, bones, organs, and water. LBM is used in pharmacokinetics for drug dosing and in nutrition for protein targets.
To use the Lean Body Mass Calculator (Boer, James & Hume Formulas), enter your Sex, Total Body Weight, Height. The calculator instantly computes LBM — Boer Formula, LBM — James Formula and more. Results update in real time as you change any input — no submit button needed.
How to Use This Calculator
Enter your Sex — select from Male, Female, Total Body Weight (e.g. 80 in kg), and Height (e.g. 178 in cm). Results update instantly — no submit button needed. Use metric or imperial units as labeled. For the most accurate result, measure height and weight in the morning without shoes.
The Formula
Boer (Male): LBM = 0.407W + 0.267H - 19.2
James (Male): LBM = 1.1W - 128(W/H)²
Hume (Male): LBM = 0.3281W + 0.3373H - 29.5
Worked Example
Male, 80 kg, 178 cm: Boer LBM = 0.407×80 + 0.267×178 - 19.2 = 65.2 kg | James = 63.7 kg | Hume = 63.9 kg. Estimated fat mass ≈ 15.5 kg.
Understanding Your Result
Health calculations based on standard clinical formulas give a population-reference estimate — individual variation exists. Compare your result to the reference ranges provided using validated sources (WHO, CDC, NIH, or specialty clinical guidelines). A single measurement is a starting point; meaningful health trends emerge from tracking the same metric over time under consistent conditions. For values outside reference ranges, consult a qualified healthcare provider before making changes to diet, exercise, or medication.
💡 Expert Health Guidance & Clinical Context
- This calculator uses clinically validated formulas and population reference data published by the WHO and NIH. Results are screening estimates, not medical diagnoses.
- Consult a licensed healthcare provider before making any changes to diet, medication, or exercise based on these results — individual variation is significant.
- Genetics, chronic conditions, and concurrent medications can dramatically affect what a "normal" result means for a specific individual.
- Track your results over time: a single data point is less meaningful than a trend measured consistently across multiple weeks or months.
- The CDC recommends adults receive routine health screenings at least annually. Use these calculations to prepare informed questions for your physician.
- Body composition, lifestyle factors, and stress levels all interact with the metrics shown here. No single number captures your full health picture.
- For pediatric or geriatric populations, reference ranges may differ significantly from the adult standards used in general calculators.
- Always cross-reference results with laboratory tests, clinical examinations, and professional medical evaluation before acting on any finding.
Results are for informational and educational purposes only. Always verify critical decisions with a qualified professional.