ToolsLean Body Mass Calculator
Body & weight
Lean Body Mass Calculator
Lean body mass is everything you are made of except fat: muscle, bone, organs and water. It is the part most worth protecting as the years go on.
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How it's calculated
We estimate it with the Boer formula, which uses your sex, weight and height. Your fat mass is simply your total weight minus your lean mass.
How to read your result
Lean mass tends to fall slowly from your forties unless you actively defend it with protein and resistance work. Watching this number hold steady, or rise, as you train is a strong sign you are building muscle rather than just losing fat.
Common questions
Muscle drives strength, metabolism and independence later in life. Protecting lean mass is one of the highest-leverage things you can do for healthy ageing.
Method: Boer formula for lean body mass.