Lean Body Mass Calculator

Calculate your Lean Body Mass (LBM) – the weight of everything in your body except fat, including muscles, bones, water, and organs.

Your Lean Body Mass Result

Formula Lean Body Mass Body Fat Mass
Boer
James
Hume
Janmahasatian

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What is Lean Body Mass?

Lean Body Mass (LBM) is the total weight of everything in your body except fat. It includes muscles, bones, water, skin, organs, and other non-fat tissues. Understanding your LBM is essential for evaluating your overall health, fitness level, and ideal body composition.

Why Use a Lean Body Mass Calculator?

Our free online Lean Body Mass Calculator helps you estimate how much of your body weight is lean tissue. Whether you're working on building muscle, losing fat, or tracking your fitness progress, calculating your LBM can give you a more accurate picture of your body composition than BMI alone.

How to Calculate Lean Body Mass

Several scientific formulas are used to calculate Lean Body Mass. Our calculator uses four popular and research-based equations:

  • Boer Formula: Ideal for clinical and general use.
  • James Formula: Commonly used in medical literature, especially for drug dosage estimation.
  • Hume Formula: Frequently applied in nutrition and body composition research.
  • Janmahasatian Formula: Preferred for obese and clinical patients, uses BMI in the calculation.

Lean Body Mass Formulas Explained

1. Boer Formula

For Men: LBM = 0.407 × Weight (kg) + 0.267 × Height (cm) - 19.2

For Women: LBM = 0.252 × Weight (kg) + 0.473 × Height (cm) - 48.3

2. James Formula

For Men: LBM = 1.1 × Weight - 128 × (Weight² / Height²)

For Women: LBM = 1.07 × Weight - 148 × (Weight² / Height²)

3. Hume Formula

For Men: LBM = 0.32810 × Weight + 0.33929 × Height - 29.5336

For Women: LBM = 0.29569 × Weight + 0.41813 × Height - 43.2933

4. Janmahasatian Formula

For Men: LBM = (9270 × Weight) / (6680 + 216 × BMI)

For Women: LBM = (9270 × Weight) / (8780 + 244 × BMI)

What Is a Healthy Lean Body Mass Percentage?

The average LBM percentage varies by gender and fitness level. Men typically have 75–90% lean mass, while women usually range from 70–85%. The remaining percentage is body fat. Our calculator shows you both LBM in kg/lbs and as a percentage of total body weight.

How to Improve Lean Body Mass

  • Strength train 3–5 times per week
  • Consume adequate protein (1.2–2.2g per kg of body weight)
  • Get enough sleep and recovery time
  • Track your body composition regularly using our LBM calculator

LBM vs. Body Fat: Know the Difference

Unlike body weight or BMI, Lean Body Mass separates your healthy tissue from fat. With our calculator, you can see not just your lean mass but also your body fat mass in both kilograms/pounds and percentage form. This provides a much clearer view of your physical health.

Frequently Asked Questions (FAQs)

Lean Body Mass (LBM) is your total body weight minus fat. It includes muscles, bones, organs, water, and other non-fat tissues.

You can calculate LBM using scientific formulas like Boer, James, Hume, or Janmahasatian. Our Lean Body Mass Calculator does the math for you using your height, weight, and gender.

For men, a healthy LBM is typically 75–90% of total body weight. For women, it ranges from 70–85%. The rest is body fat.

Lean body mass helps assess your fitness and metabolism. It’s crucial for determining calorie needs, muscle growth, and fat loss goals.

It depends on your needs. Boer is great for general use, Hume for clinical studies, James for drug dosage calculations, and Janmahasatian for obese individuals.

Yes! You can increase LBM through strength training, protein-rich nutrition, adequate sleep, and consistency in workouts.

Start Tracking Your LBM Today

Use our free, mobile-friendly Lean Body Mass Calculator to estimate your muscle mass, understand your body fat, and set smarter health goals. Whether you're bulking, cutting, or maintaining, tracking LBM gives you insights that the scale alone can't provide.

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