Lean Body Mass Calculator

Calculate your estimated lean body mass using multiple proven formulas

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Lean Body Mass Calculator

Calculate your estimated lean body mass (LBM) based on body weight, height, gender, and age. Compare results from multiple proven formulas.

📝 Body Information

cm
kg

📊 Lean Body Mass Results

Formula Lean Body Mass Body Fat %
Boer
57.2 kg
(82%)
 18%
James
55.8 kg
(80%)
 20%
Hume
54.6 kg
(78%)
 22%

Body Composition Summary

Total Body Weight 70.0 kg
Average Lean Body Mass 55.9 kg
Average Body Fat Percentage 20%

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📚 Understanding Lean Body Mass

What is LBM?

Lean Body Mass (LBM) is the difference between total body weight and body fat weight. It includes bones, muscles, blood, skin, and organs.

Multiple Formulas

Different formulas (Boer, James, Hume) provide varying estimates. Compare results from all formulas for a comprehensive view.

Medical Applications

LBM is used for medication dosages, particularly water-soluble drugs, and various medical examinations.

Lean Body Mass Formulas

The Boer Formula

For males: eLBM = 0.407W + 0.267H - 19.2
For females: eLBM = 0.252W + 0.473H - 48.3

The James Formula

For males: eLBM = 1.1W - 128(W/H)²
For females: eLBM = 1.07W - 148(W/H)²

The Hume Formula

For males: eLBM = 0.32810W + 0.33929H - 29.5336
For females: eLBM = 0.29569W + 0.41813H - 43.2933

The Peters Formula (for Children)

For children 14 or younger: eLBM = 3.8 × eECV
Where eECV = 0.0215 × W^0.6469 × H^0.7236
This formula is specifically designed for pediatric patients and provides more accurate estimates for children.

Note: In the formulas above, W is body weight in kilograms and H is body height in centimeters.