Lean Mass Weight Calculator
Estimate your lean body mass (LBM) based on weight, height, age, and gender using the Boer formula. Ideal for fitness and health tracking.
Published by:
isCalculator Editorial Team
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How to use this tool?
How to Use the Lean Mass Calculator
This calculator estimates your lean body mass (weight of muscles, bones, organs, and water) using the Boer (1984) formula. All inputs must be in metric units (kg and cm).
- Enter your weight (kg) – valid range: 20–500 kg.
- Enter your height (cm) – valid range: 50–300 cm.
- Enter your age (years) – valid range: 10–120 years.
- Select your gender (Male or Female).
- Click “Calculate Lean Mass”.
Your result will appear below with a breakdown of inputs and the calculated lean mass in kilograms. If any input is invalid, an error message will guide you to correct it.
Previous Results
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Frequently Asked Questions
Lean body mass (LBM) is the total weight of your body minus all fat. It includes muscle, bone, organs, and water. It is a key metric for assessing body composition.
This calculator uses the Boer formula (1984): For males: LBM = 0.407 × weight (kg) + 0.267 × height (cm) - 19.2. For females: LBM = 0.252 × weight (kg) + 0.473 × height (cm) - 48.3.
Tracking lean mass helps monitor muscle gain or loss, assess metabolic health, and guide nutrition and exercise programs. It is more informative than total weight alone.
