FFMI Calculator
Estimate fat-free mass index from weight, height, and body-fat percentage.
FFMI + normalized FFMI
Body-fat based
Category scale
What FFMI measures
FFMI estimates lean mass relative to height, which helps compare muscularity independent of body-fat percentage.
Assumptions
Uses body-fat percentage to estimate lean mass, then divides by height squared. Normalized FFMI adjusts to a reference height of 1.8 m.
Use trend over time
Track FFMI over time with consistent body-fat measurement methods for more useful comparisons.