Lean Body Mass Calculator

Estimate lean body mass from body weight and body fat percentage.

Preparing Lean Body Mass Calculator

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Input

Enter weight and body-fat percentage, and the calculator will estimate how much of total body weight is lean mass. This tool shows the result instantly without step-by-step output.

Input summary

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How to use Lean Body Mass Calculator

Provide total weight and body-fat percentage, and the calculator will split body weight into lean and non-lean portions.

What this calculator is for

This calculator is for body-composition tracking, training review, and understanding the relationship between total weight and lean mass. The quality of the answer depends heavily on how accurate the body-fat estimate is.

Tips

If the body-fat percentage comes from a rough device or tape estimate, the lean-mass result will inherit that uncertainty.
Lean body mass includes more than muscle; it also includes water, bone, and organs.
Use repeated measurements taken under similar conditions if you want to compare trends over time.