Muscle Mass Calculator

Calculate your Lean Body Mass (LBM) using Boer, James, and Hume formulas.

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Features

Multi-Formula Analysis

Utilizes Boer, James, and Hume formulas to provide a comprehensive LBM estimate.

Gender-Specific Logic

Applies distinct biological constants for men and women to ensure accuracy.

Metric & Imperial Support

Seamlessly calculate using kg/cm or lbs/ft+in without manual conversions.

Body Composition Insight

Derive your approximate Body Fat percentage by comparing total weight to lean mass.

About Muscle Mass Calculator

The Muscle Mass Calculator is a specialized tool designed to estimate your Lean Body Mass (LBM), which is the weight of your body minus your body fat. Understanding your LBM is crucial for athletes, bodybuilders, and fitness enthusiasts because it provides a more accurate measure of progress than weight alone. By using three scientifically validated anthropometric formulas—Boer, James, and Hume—this calculator offers a robust estimate based on your gender, height, and weight. Whether you are aiming to build muscle or lose fat, tracking your LBM helps you ensure that your weight changes are moving in the right direction.

How to Use Muscle Mass Calculator

  • 1
    Select Gender

    Choose your biological sex as the formulas rely on gender-specific coefficients.

  • 2
    Choose Units

    Select your preferred measurement system: Metric (kg/cm) or Imperial (lbs/in).

  • 3
    Enter Measurements

    Input your current weight and height accurately.

  • 4
    Review Analysis

    View your estimated Lean Body Mass and compare results across different scientific formulas.

Frequently Asked Questions

It provides an estimate based on population averages (Boer, James, Hume formulas). DEXA scans are the most accurate method.
Each formula (Boer, James, Hume) was developed using different study groups and statistical methods. We show all for comparison.
Not exactly. Lean Body Mass includes organs, skin, bones, and body water, not just skeletal muscle.
Resistance training (weight lifting) combined with adequate protein intake is the most effective way to build muscle and increase LBM.
Yes, without regular strength training, humans naturally lose muscle mass (sarcopenia) as they age, typically starting after 30.
Measure in the morning, fasting, after using the restroom, and before exercise for the most consistent day-to-day comparison.