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FFMI Calculator

Your lean mass for your height, from your weight, height and body fat.

FFMIexample

—kg/m²

Fill in your numbers and it shows up here.

Sex
ftin
%
Don't know it? Work it out
How it's calculated
  1. Formulalean mass ÷ height² with height in metres. Lean mass is weight × (1 − body fat).
  2. AdjustedFFMI + 6.1 × (1.8 − height), which brings tall and short people onto one scale. The scale shows the adjusted value.
  3. Mark at 25Men only: the highest adjusted value among the 74 athletes in the study who had not used steroids. The study had no women, so there is no mark for them.
  4. SourceKouri et al., 1995
  5. LimitsAs exact as your body fat: if that is an estimate, so is FFMI.