Body composition
Soft lean mass
Fat-free mass with the bone subtracted: muscle, organs, and the water inside them.
Unit kg
What it is
Fat-free mass with the bone subtracted: muscle, organs, and the water inside them.
Why it matters
It is the part of your fat-free mass that can actually change month to month, since bone barely moves.
Reading the number
It is easily mistaken for fat-free mass, which is this number plus bone mineral content. A sheet printing both is not printing the same thing twice.
What moves it
hydrationlast mealrecent exercisetime of daythe device used
When to raise it
Worth reading with fat-free mass and skeletal muscle rather than on its own.
Also known as
On a report in another language.
A lab report names this analyte in its own language. Vitals Vault recognises each of these and files them all under Soft lean mass.
SLMMassa MagraMassa Magra MolePehme kehamassMagerweichmasseMasa magra blandaMasse maigre molle
Catalog entry last updated 2026-08-29. Browse all 165 metrics.