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Lean Body Mass Calculator

Disclaimer: This calculator provides an estimate of lean body mass and body composition. Use it for guidance, not diagnosis.

Estimate lean mass, fat mass, BMR, and TDEE using Boer, Hume, or body-fat based methods.

Use Cases

  • • Track muscle-preserving fat loss progress
  • • Compare LBM across multiple formulas
  • • Estimate maintenance calories at current composition
  • • Plan protein targets from lean mass

Formulas Used

  • • Boer and Hume LBM formulas
  • • LBM from body-fat percentage
  • • BMR via Mifflin-St Jeor
  • • TDEE = BMR × Activity Level

Enter Your Details

Calculate lean body mass with personalized health insights and body-composition guidance.