Lean Body Mass Calculator
Calculate your lean body mass (muscle, bones, organs) and fat mass. Get accurate body composition analysis with AI-powered fitness insights.
What is Lean Body Mass?
Lean Body Mass (LBM) is the total weight of your body minus all the weight due to fat mass. It includes the weight of your muscles, bones, organs, water, and everything else that isn't fat. Understanding your LBM is crucial for fitness planning, nutrition, and tracking progress. Our free LBM calculator provides instant, accurate results to help you optimize your fitness journey.
Calculate Your Lean Body Mass
Enter your weight and body fat percentage to calculate your lean mass
Don't know your body fat percentage?
Use our Body Fat Calculator to estimate it first.
Frequently Asked Questions
What is lean body mass?
Lean body mass (LBM) is your total body weight minus fat mass. It includes muscle, bone, organs, water, and connective tissue. LBM is a key metric for fitness and health, as it represents your metabolically active tissue.
Why is lean body mass important?
LBM is crucial because it determines your metabolic rate, physical strength, and overall health. Higher LBM means higher metabolism, better insulin sensitivity, and improved functional fitness. Tracking LBM helps ensure weight loss comes from fat, not muscle.
How can I increase my lean body mass?
Increase LBM through resistance training (weightlifting), adequate protein intake (1.6-2.2g per kg bodyweight), progressive overload, sufficient sleep, and eating at a slight caloric surplus. Consistency in training and nutrition is key for muscle growth.
What's the difference between lean mass and muscle mass?
Lean body mass includes all non-fat tissue: muscle, bones, organs, water, and connective tissue. Muscle mass is just the skeletal muscle component. LBM is typically 60-80% muscle, with the rest being bones, organs, and other tissues.