Calculate your lean body mass (everything except fat) from your total weight and body fat percentage.
Calculate your lean body mass (everything except fat) from your total weight and body fat percentage.
LBM = Weight × (1 – Body Fat% / 100)
80 kg at 20% body fat → LBM 64 kg, Fat Mass 16 kg.
Enter your values in the fields above and click "Calculate" to get instant results. All calculations happen in your browser — nothing is sent to any server.
What is Lean Body Mass Calculator?
Calculate your lean body mass (everything except fat) from your total weight and body fat percentage.
What formula does this use?
This calculator uses: LBM = Weight × (1 – Body Fat% / 100)
Is this calculator free?
Yes! All calculators on CalcNest AI are 100% free with no account required.
Is my data safe?
Absolutely. All calculations run locally in your browser. We never store or transmit your input data.