# Lean Body Mass Calculator

> Estimate lean body mass (and fat mass) from body weight and body fat percentage, or via the Boer, James, and Hume formulas from height and weight. Educational estimate, not a DEXA result.

**URL:** https://www.calculatoranswers.com/lean-body-mass-calculator
**Category:** Health

## Quick Answer

Estimate your lean body mass and fat mass. Enter your height, weight, gender, and optionally body fat percentage to calculate your body composition.

## Definition

Lean body mass represents the total weight of the body minus the weight of its fat mass, encompassing muscles, bones, organs, connective tissue, and water. A lean body mass calculator estimates this value using either direct body fat percentage inputs or established anthropological formulas such as the Boer, James, and Hume equations, which utilize height and weight. Fitness professionals, athletes, and clinicians use lean body mass measurements to evaluate body composition changes, tailor nutritional plans, and calculate appropriate medication dosages based on non-fat mass.

## How to Use

1. **Select calculation method** — Choose whether to calculate using body fat percentage or body measurements like height and weight.
2. **Enter physical metrics** — Input your height, weight, age, and biological gender into the respective fields.
3. **Read the results** — View your estimated lean body mass, fat mass, and body fat percentage breakdown.

## Disclaimer

This calculator provides estimates for educational and planning purposes. Always consult a qualified professional for specific advice on financial, medical, legal, or other regulated decisions.

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