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Lean Body Mass Calculator
Estimate lean body mass from weight and body-fat percentage.
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FAQs
What exactly is lean body mass?
Lean body mass (LBM) is everything that isn't fat: muscle, bone, organs and water. It's the number behind smarter dosing — protein and creatine targets scale better with LBM than with total bodyweight, especially at higher body-fat levels.
Why should I track LBM instead of just bodyweight?
Because the scale can't tell muscle from fat. During recomposition (building muscle while losing fat), bodyweight can stay flat while LBM rises — tracking LBM shows real progress the scale hides.
How accurate are LBM formulas?
Equations like Boer estimate LBM from height and weight with reasonable population-level accuracy but can miss individual variation. DEXA scans are the practical gold standard; if you use formula estimates, apply them consistently and watch the trend.