# Lean Body Mass Calculator

This Lean Body Mass Calculator allows you to estimate your lean body mass (LBM) based on your gender, body weight and height. The calculator employs four powerful algorithms – the Boer, the James, the Hume, and the Peters equations – to calculate your LBM.

This tool is exceptionally easy to use. Simply follow the five basic steps below:

• 1. Select your measurement system (imperial or metric)
• 2. Select your gender (female or male)
• 3. Input details of your weight and height
• 4. Choose which equation you would like to use to calculate your LBM, and
• 5. Hit "Calculate" to compute your LBM.
LBM Calculator

Results
Estimated Lean Body Mass (LBM):
Estimated Body Fat Mass (BFM):

## Reference

Lean Body Mass (LBM) equals a person's total body weight minus their total fat mass, so the main equation is as follows:

LBM = BW - BF
Where, LBM is the lean body mass, BW is the body weight, BF is the body fat.

## Formulas

The equations to compute your LBM are listed below:

### The Boer equation

Women: 0.252 × weight[kg] + 0.473 × height[cm] - 48.3
Men: 0.407 × weight[kg] + 0.267 × height[cm] - 19.2

### The James equation

Women: 1.07 × weight[kg] - 148 × ( weight[kg] / height[cm] ) 2
Men: 1.1 × weight[kg] - 128 × ( weight[kg] / height[cm] ) 2

### The Hume equation

Women: 0.29569 × weight[kg] + 0.41813 × height[cm] - 43.2933
Men: 0.32810 × weight[kg] + 0.33929 × height[cm] - 29.5336

### The Peters equation

This equation is used to estimate LBM of children (up to 13 to 14 years old).

0.0817 × ( (weight[kg]) 0.6469 × (height[cm]) 0.7236 )

### More References

1. Hume R. Prediction of lean body mass from height and weight. J Clin Pathol. 1966 Jul; 19(4):389-91.

2. Boer P. Estimated lean body mass as an index for normalization of body fluid volumes in humans. Am J Physiol. 1984 Oct; 247(4 Pt 2):F632-6.

3. Fuchs RJ, Theis CF, Lancaster MC. A nomogram to predict lean body mass in men. Am J Clin Nutr. 1978 Apr; 31(4):673-8.

4. Peters AM, Snelling HL, Glass DM, Bird NJ. Estimation of lean body mass in children. Br J Anaesth. 2011 May; 106(5):719-23.

You may also be interested in our Ideal Body Weight Calculator

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