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FFMI Calculator
Fat-Free Mass Index — a height-adjusted benchmark for how much muscle you carry. Adjusted for tall lifters so a 6′5″ lifter compares fairly with a 5′8″ one.
Body fat18%
FFMI
20.7
Raw fat-free mass index.
Adjusted FFMI
20.7
Height-adjusted — the fair comparison.
Lean mass
66 kg
Everything that is not fat.
Where you land
Fit
Clearly trained, with visible muscle.
FFMI is a research benchmark, not a judgment. Your body-fat estimate is the weakest input — measure it the same way each time and treat the result as a range.