Lean Body Mass Calculator
Use this Lean Body Mass Calculator tool to measure your muscle, bone, and water weight (excluding fat) for precise nutrition dosing
Why Calculate Lean Body Mass?
Lean Body Mass (LBM) = total weight minus fat mass. Essential for protein dosing (1.6-2.2g/kg LBM), hydration formulas, drug clearance, and accurate TDEE calculation. Boer formula used here (validated, simple, accurate ±3% vs DEXA).
Gender-Specific Formulas
- Select Male/Female (separate Boer equations).
- Enter height and weight (Metric/Imperial).
- Get LBM, Fat-Free Mass Index (FFMI), and nutrition recommendations.
FAQs
- Boer vs other LBM formulas?
- Boer ±3% vs DEXA. James formula overestimates women by 5kg. Boer validated across ages/ethnicities [web:23].
- Why LBM better than total weight for protein?
- 2g/kg LBM = precise dosing. 2g/kg total weight over-doses obese by 30-50g protein daily.
- FFMI reliable indicator?
- Yes – normalized for height. >25 flags potential AAS use (steroids) in competitive athletes.
- Does LBM include bones/organs?
- Yes – muscle (50%), bone (20%), organs/water (30%). Excludes only adipose tissue.
- Weekly LBM change realistic?
- Muscle gain: 0.25-0.5% bodyweight/week (trained). >1% unsustainable without drugs.
