Lean Body Mass Calculator
Estimate how much of your body is lean mass (muscle, bone, organs, water) versus fat, using the Boer formula.
0 kg
estimated lean body mass
0fat mass
0body fat (approx)
Enter your weight and height to estimate lean mass.
This is an estimate from a population formula and does not replace clinical body composition testing. It is not medical advice. For an accurate assessment, consult a licensed physician.
Good to know
What is lean body mass?
Everything in your body that is not fat: muscle, bone, organs, and water.
Why does it matter for weight loss?
The goal is to lose fat while keeping lean mass. Crash diets can cost muscle; enough protein and some training help protect it.
How is it calculated?
We use the Boer formula from your height, weight, and sex. It is an estimate, not a body scan.