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Lean Body Mass Calculator

Find out your body weight excluding fat. Useful for accurate macronutrient planning.

Gender

Lean Body Mass

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Method

How this calculator works

Male LBM = 0.407 * W + 0.267 * H - 19.2 | Female LBM = 0.252 * W + 0.473 * H - 48.3

Male:   (0.407 × W) + (0.267 × H) - 19.2
Female: (0.252 × W) + (0.473 × H) - 48.3
  1. Select your gender.
  2. Enter your body weight in kg.
  3. Enter your height in cm.
  4. The calculator uses the Boer formula to estimate your lean body mass and body fat percentage.

Examples

Worked examples

Real numbers, end-to-end results.

Male, 80kg, 180cm

LBM: 61.4 kg

Body fat is approx 18.6 kg (23.3%).

Female, 65kg, 165cm

LBM: 46.1 kg

Body fat is approx 18.9 kg (29.0%).

Use cases

When to use it

  • Calculate macros based on lean mass rather than total weight.
  • Track muscle growth vs fat loss over time.

Disclaimer: This calculator provides estimates for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider for decisions affecting your health. Results depend on the accuracy of inputs provided.

FAQ

Frequently asked questions

What is Lean Body Mass (LBM)?
Lean body mass is your total body weight minus your body fat. It includes your organs, skin, bones, body water, and muscle mass.
Why is the Boer formula used?
The Boer formula is one of the most accurate ways to estimate LBM based simply on height, weight, and gender without needing special equipment.

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