About FFMI Calculator
Calculate Fat-Free Mass Index (FFMI) to evaluate natural muscular development and genetic limit.. Designed for accurate, instantaneous calculations with zero wait time.
Formula
FFMI = [Weight × (1 - BF% / 100)] / Height² | Normalized FFMI = FFMI + 6.1 × (1.8 - Height)
Example Calculation
A 78kg lifter at 178cm with 12% body fat has a normalized FFMI of 21.8 (Very athletic).
How to Use
- Enter your values into the form fields above.
- The calculation updates immediately in real time.
- Inspect the main summary and secondary breakdowns below.