Lean Body Mass Calculator
Total mass of muscle, bone, organs, and body water excluding adipose tissue
Input Parameters
Real-time calculation updates dynamically as you adjust inputs. Values remain strictly local on your device.
Lean Body Mass (LBM)82% of Total Mass
61.5kg
Equivalent to 136 lbs of fat-free tissue
Fat Mass
13.5kg
Normalized FFMI
20.4kg/m²
Above AverageClinical Responsibility Note: This calculation provides statistical estimations for informational and educational purposes only. It is not an individualized medical diagnosis or clinical prescription.
Mathematical Formula & Scientific Methodology
Formula: Direct Body Composition Subtraction
LBM = Weight × (1 - BodyFatPct / 100)Separates total scale weight into metabolically active lean tissue and storage adipose tissue.
Model Assumptions
- Accurate body fat percentage assessment
Variables & Standard Units
| Symbol | Physiological Meaning | Unit |
|---|---|---|
| Weight | Total body weight | kg |
| BodyFatPct | Adipose tissue percentage | % |
Scientific Limitations
- Hydration shifts (glycogen and water retention) can temporarily alter lean mass measurements
Peer-Reviewed Scientific Citations
A reanalysis of the factors influencing basal metabolic rate in normal adults: importance of fat-free mass (1980)
Cunningham JJ (1980) — The American Journal of Clinical Nutrition, 33(11), 2372-2374
Key Finding: Demonstrated that lean body mass accounts for nearly all variance in basal metabolic rate between sexes and ages.
Frequently Asked Questions
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