About the Lean Body Mass Calculator
The Lean Body Mass Calculator is designed to give you a quick, practical estimate using the information you enter. Estimate fat-free body mass from height, weight and sex. The tool supports the unit choices shown in the calculator and presents the result in a format that is easy to compare with related weight-management measures.
Use the calculator by entering the requested values and selecting Calculate. The result card explains the main estimate and, where useful, shows supporting values that help you understand how the answer was derived. Select Reset to clear the form and start again.
This calculator is intended for general educational and planning purposes. It uses published equations or standard mathematical relationships, but individual needs and outcomes can vary. Treat the result as an estimate rather than a diagnosis, prescription, or guarantee.
Estimate fat-free body mass from height, weight and sex.
What Is Lean Body Mass?
Lean body mass is body weight minus fat mass. It includes muscle, bone, organs, water, and other non-fat tissues.
Estimates can be useful when comparing body-composition changes or setting protein targets, but equation-based results are approximations.
Formula / Method Used
Uses the Boer equations: male LBM = 0.407W + 0.267H − 19.2; female LBM = 0.252W + 0.473H − 48.3, with kg and cm.
How to Use the Lean Body Mass Calculator
- Choose the unit system or options requested by the tool.
- Enter the required measurements or planning values.
- Select Calculate to view your result and supporting details.
- Review the explanation and limitations before using the estimate for planning.
Example Calculation
An 80 kg, 175 cm male produces an estimated lean body mass in the mid-50 kg range.
Limitations
The equation is population-based and may be less accurate at body-size extremes or for unusually muscular individuals.
Frequently Asked Questions
Is this calculator exact?
No. It provides an estimate based on the inputs and method shown on the page.
Can I use the result as medical advice?
No. The result is for general informational and educational use and does not replace individualized advice from a qualified healthcare professional.
Can I switch between Metric and US units?
Where measurements are required, the calculator supports the unit systems displayed in the form.
Methodology & References
Uses the Boer lean-body-mass equation.