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Lean Body Mass Calculator FullScreen

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.

LBM Calculator

Estimated Lean Body Mass (LBM): 117.943 lbs (71.5%)
Estimated Body Fat Mass (BFM): 47.057 lbs (28.5%)



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

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


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 )

What is Lean Body Mass Calculator

The Lean Body Mass (LBM) calculator is a tool used to estimate the weight of the body's lean tissue, which includes muscles, bones, organs, and fluids, excluding fat mass. LBM is an important component in assessing body composition and can be helpful for various health and fitness purposes. Here's how a Lean Body Mass calculator typically works:

  1. Input Variables: To calculate LBM, the calculator requires several inputs, including gender, height, weight, and sometimes additional measurements like body fat percentage or wrist circumference.

  2. Calculation Method: There are various formulas available to estimate Lean Body Mass based on different factors. One commonly used formula for adults is the Boer formula:

    • For males: LBM = (0.407 × weight in kg) + (0.267 × height in cm) - 19.2
    • For females: LBM = (0.252 × weight in kg) + (0.473 × height in cm) - 48.3

    These formulas provide an estimation of the lean body mass based on weight and height.

  3. Interpretation: The calculated LBM represents the estimated weight of lean tissue in the body. LBM is an important measurement for various purposes, such as determining daily calorie needs, assessing muscle development, and monitoring changes in body composition during weight loss or fitness programs.

It's important to note that Lean Body Mass calculators provide estimations and may not be as accurate as more advanced techniques like dual-energy X-ray absorptiometry (DXA) or body composition analysis. Additionally, formulas may vary for different populations, such as children, athletes, or older adults.

Consulting with a healthcare professional, registered dietitian, or fitness expert can provide more accurate and personalized assessments of Lean Body Mass, as well as guidance on how to interpret the results within the context of overall health and fitness goals.

Lean Body Mass Calculator Example

Certainly! Here's an example of using a table to calculate the lean body mass for different individuals:

Assume the following information for three individuals:

Individual Weight (lbs) Body fat percentage Lean Body Mass (lbs)
Person A 180 15 153
Person B 160 20 128
Person C 200 10 180

To calculate the lean body mass for each person, we can use the formula:

Lean Body Mass = Weight - (Body fat percentage / 100) * Weight

Using the given values, we can calculate the lean body mass for each individual:

For Person A: Lean Body Mass = 180 - (0.15 * 180) = 180 - 27 = 153 lbs

For Person B: Lean Body Mass = 160 - (0.20 * 160) = 160 - 32 = 128 lbs

For Person C: Lean Body Mass = 200 - (0.10 * 200) = 200 - 20 = 180 lbs

Therefore, the lean body mass for Person A is 153 lbs, for Person B is 128 lbs, and for Person C is 180 lbs.

Using a table allows you to input the weight and body fat percentage for each individual and calculate their respective lean body mass. Lean body mass represents the weight of everything in the body except for fat, including muscle, bones, organs, and water. It's a useful measure for assessing body composition and can be used in various health and fitness applications.