Lean Body Mass Calculator
Calculate your lean body mass and fat-free weight
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If you know your body fat percentage, enter it for more accurate results.
About This Tool
Calculate your lean body mass (LBM) using the scientifically validated Boer formula. Lean body mass includes muscles, bones, organs, and water - everything except fat. Knowing your LBM helps you understand your true body composition, set realistic fitness goals, and track muscle gain or loss during weight changes.
Frequently Asked Questions
What is lean body mass?
Lean body mass (LBM) is the total weight of your body minus all fat mass. It includes muscles, bones, organs, skin, and body water. LBM is a better indicator of metabolic health than total weight alone, as it shows how much metabolically active tissue you have.
Why is lean body mass important?
Lean body mass determines your basal metabolic rate (BMR) - higher LBM means you burn more calories at rest. Preserving or increasing LBM during weight loss helps maintain metabolism, strength, and overall health. It's also crucial for athletic performance and healthy aging.
How accurate is the Boer formula?
The Boer formula is one of the most accurate equations for estimating lean body mass without direct measurement. It's validated in scientific studies and accounts for height and gender differences. For precise measurements, DEXA scans or BIA devices are recommended.
How can I increase my lean body mass?
To increase LBM: 1) Strength training 2-3 times weekly, 2) Consume adequate protein (1.6-2.2g/kg), 3) Eat at a slight calorie surplus for muscle gain, 4) Get enough sleep and recovery. Focus on compound exercises like squats, deadlifts, and presses.
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