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Lean Body Mass Calculator

Estimate your lean body mass (LBM) – weight minus fat – with the Boer, James and Hume formulas.

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Estimates only – not medical advice.

What is the Lean Body Mass Calculator?

Lean body mass (LBM) is your total weight minus body fat – muscles, bones, organs and water. It is useful for setting protein targets, tracking fitness progress and some medication dosing. This calculator estimates LBM from height and weight using three published formulas: Boer, James and Hume.

How to use the Lean Body Mass Calculator

  1. Choose gender.
  2. Enter weight and height.
  3. Compare the three estimates.

Frequently asked questions

Which formula is best?

Boer is widely used for adults; the three give a sensible range.

How can I measure more accurately?

DEXA scans or bioimpedance scales measure body composition directly.

Does muscle weigh more than fat?

A kilogram is a kilogram, but muscle is denser, so it takes less space.

Is it free?

Yes.

This lean body mass calculator is 100% free, needs no signup and works on phones, tablets and computers. Your data is processed in your browser and never uploaded.

Last updated: · By NodifyTech