FFMI Calculator

Fat-Free Mass Index strips away body fat to show how much muscle you actually carry — and where you stand vs. the natural ceiling.

Height

Weight

Body fat percentage

If unsure, a good caliper or DEXA scan is far more reliable than guessing.

Reference points
Average man ~20 · average woman ~18. Elite natural lifters reach ~24–25. Above 25–26 is generally considered beyond natural limits.

💪 Muscle, not mass

Removes fat to compare muscle fairly.

📊 Height normalized

Fairer across tall & short lifters.

🥇 Natural limit check

See where you sit vs. ~25 ceiling.

🧠 Simple inputs

Height, weight, body fat — done.