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Lean Body Mass Calculator

Estimate fat-free mass from body weight and body-fat percentage.

My tools →
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Estimated lean mass

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Estimated fat mass

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Estimate depends on the accuracy of your body-fat percentage.

Runs in your browser – your data never leaves your device Also available via our free API

How to use the Lean Body Mass Calculator

  1. 1 Enter the requested details.
  2. 2 Review the estimate and the limitations shown with it.

How the estimate works

Lean body mass (also called fat-free mass) is estimated as total body weight multiplied by one minus the body-fat fraction. The remaining amount is estimated fat mass. Results depend on the accuracy of the body-fat estimate and do not measure muscle alone. Source: CDC adult BMI information.

How to use this calculator

Enter the requested values and review the result alongside the limits of the estimate.

Important limitations

This result is for general information. Individual circumstances can change what is appropriate; consult a qualified professional when making health decisions.

Frequently asked questions

How does this calculator work?

Lean body mass (also called fat-free mass) is estimated as total body weight multiplied by one minus the body-fat fraction. The remaining amount is estimated fat mass. Results depend on the accuracy of the body-fat estimate and do not measure muscle alone. Source: [CDC adult BMI information](https://www.cdc.gov/bmi/adult-calculator/index.html).

Is this a diagnosis or personalized advice?

No. This is an informational estimate and does not replace professional advice.

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