Is LBM Calculator free?

Yes, completely free. No registration needed.

What is Lean Body Mass (LBM)?

LBM is total body weight minus fat weight. It includes muscles, bones, organs, blood, and other non-fat tissues. LBM is a key metric for fitness assessment, BMR calculation, and medical dosage.

Which formula should I use?

The Boer formula is recommended for general populations. The James formula is better suited for athletes. The Hume formula is a classic but older equation. Compare all three using the comparison table.

What is a healthy body fat percentage?

For men: athletes 6-13%, fit 14-17%, acceptable 18-24%, obesity >25%. For women: athletes 14-20%, fit 21-24%, acceptable 25-31%, obesity >32%.

Does this calculator upload my data?

No. All calculations are performed locally in your browser. No data is sent to any server.

How can I use LBM for fitness?

Set protein intake at 2-3g per kg of LBM for muscle building. Track LBM monthly to ensure you're gaining muscle (not fat) during bulking, or preserving muscle during cutting.

Free Online Lean Body Mass (LBM) Calculator

How to Use

Enter height (cm), weight (kg), gender, and age. Select a formula (Boer recommended). The calculator shows LBM, body fat percentage, and fat mass. Use the comparison table to see results from all formulas.

💪 Lean Body Mass Calculator

How to Use