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Lean Body Mass Calculator

Estimate your lean body mass and body fat using the Boer formula.

Lean Body Mass
54.7 kg
Body Fat Mass
15.3 kg
Body Fat %
21.9%

Summary

Your lean body mass is approximately 54.7 kg, with 15.3 kg of fat mass (21.9% body fat).

Boer Formula (1984)

Male Formula

LBM = 0.407 × weight(kg) + 0.267 × height(cm) − 19.2

Female Formula

LBM = 0.252 × weight(kg) + 0.473 × height(cm) − 48.3

Lean Body Mass Calculator

Lean Body Mass (LBM) represents the total weight of your body minus fat mass — including muscles, bones, organs, and water. Knowing your LBM is essential for setting accurate nutrition goals, tracking body composition changes, and understanding your baseline metabolic needs.

This calculator uses the Boer formula (1984), which estimates lean body mass from weight, height, and sex. It also computes your body fat mass and body fat percentage, giving you a complete picture of your body composition.

How it works

Boer Formula — Male: LBM = 0.407 × weight(kg) + 0.267 × height(cm) − 19.2. Female: LBM = 0.252 × weight(kg) + 0.473 × height(cm) − 48.3. Fat Mass = Total Weight − LBM.

Use cases

  • Setting protein intake targets based on lean mass
  • Tracking body recomposition progress over time
  • Estimating resting metabolic rate more accurately than weight alone
  • Guiding strength training and nutrition planning

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