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Lean Body Mass

Calculate your lean body mass (total weight minus fat) using the Boer formula based on height and weight.

Our free Lean Body Mass lets you calculate your lean body mass (total weight minus fat) using the Boer formula based on height and weight. It is built for individuals tracking fitness, nutrition, and wellness goals who need fast, reliable results without installing software or creating an account.

Lean Body Mass runs entirely in your browser on CalculatorsPlus — enter your values, get instant results, and copy or share your output in one click. Your data never leaves your device; we do not store inputs on any server.

Wellness metrics like those from the lean body mass are most useful when tracked over weeks and months. Record your results, note lifestyle changes, and discuss trends with a qualified health professional when making significant diet or training decisions.

Results update in real time as you change inputs, so you can explore "what if" scenarios — adjust one variable at a time to see how it affects the outcome before committing to a purchase, plan, or decision.

This page includes step-by-step instructions, frequently asked questions, and practical tips below the calculator. Bookmark it for repeat use — many health tasks come up weekly during projects, studies, or financial planning.

Common Uses

  • ✓Set a baseline with the lean body mass and track progress over time
  • ✓Prepare informed questions for doctors, trainers, or nutritionists
  • ✓Compare estimates across different activity levels or inputs
  • ✓Quick checks during meal planning, workouts, or pregnancy tracking

How to Use the Lean Body Mass

  1. 1

    Enter weight and height

    Input your weight and height in metric or imperial units.

  2. 2

    Enter gender

    Select your gender for the appropriate formula.

  3. 3

    View LBM estimate

    See your estimated lean body mass and fat mass in kg/lbs.

💡 Tips & Tricks

  • •Track LBM over time to ensure weight loss comes from fat, not muscle.
  • •Higher LBM means a higher resting metabolic rate.
  • •Use LBM (not total weight) to calculate protein needs for more accurate targets.

Frequently Asked Questions

What is lean body mass?
Lean body mass (LBM) is your total body weight minus your fat weight. It includes muscles, bones, organs, water, and everything that is not fat tissue.
How is LBM calculated?
LBM can be estimated using formulas like Boer: Men: 0.407×weight(kg) + 0.267×height(cm) – 19.2. Women: 0.252×weight(kg) + 0.473×height(cm) – 48.3.
Why is LBM important?
LBM determines your metabolic rate, strength potential, and protein needs. Preserving LBM during weight loss ensures you lose fat, not muscle.
How do I preserve lean body mass while losing weight?
Eat adequate protein (1.6–2.2g/kg), perform resistance training, maintain a moderate calorie deficit (500 cal/day max), and ensure adequate sleep.

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