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 Lean Body Mass (LBM) Calculator

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Updated: 2026-07-11

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.

What is Free Lean Body Mass (LBM) CalculatorBase?

Free Lean Body Mass (LBM) CalculatorBase is a free online tool that runs entirely in your browser. No download or signup needed — enter Height and Weight to get results instantly. All data is processed locally.

Use Cases

Verify mathematical calculations during study or teaching
Solve geometry problems quickly in engineering work
Calculate ratios and percentages in daily life
Mobile math calculations without a calculator app

Key Features

Completely Free: No registration, no limits
Privacy Safe: Data never leaves your browser
Cross-Platform: Any modern browser
Zero Dependencies: Open and use