Calculate your Lean Body Mass from weight and height using Boer, James and Hume formulas — with fat mass estimate and daily protein target.
Enter your figures and click Calculate to see your results.
Enter your gender, weight and height. If you know your body fat percentage, enter it too for the most direct LBM calculation.
Press the Calculate button. Results appear instantly using standard clinical and scientific formulas.
Results are displayed with all key values clearly labelled. Use the Copy button to grab your results or Download to save a text file. For health decisions, always consult a healthcare professional.
Yes — completely free with no sign-up required. All calculations run privately in your browser.
Results use standard clinical formulas. For health decisions, always consult a qualified healthcare professional.
Yes — fully responsive and works on all devices.
No — all calculations happen locally in your browser. Nothing is uploaded or stored.
Yes — use the Download button to save a text summary of your results.
