FFMI Calculator
Analyze your muscle mass, genetic potential, and fitness ranking.
Understanding Your FFMI Score
The Fat-Free Mass Index (FFMI) is a superior metric compared to the standard Body Mass Index (BMI) for athletes and fitness enthusiasts. While BMI only considers total weight, FFMI accounts for your muscle mass relative to your height, providing a clearer picture of your physical development.
| FFMI Range (Men) | Classification | Description |
|---|---|---|
| 16 – 17 | Below Average | Low muscle mass relative to height. |
| 18 – 19 | Average | Typical for the general population. |
| 20 – 21 | Above Average | Indicates consistent training and good muscle base. |
| 22 – 23 | Excellent | Highly developed physique, typical of fitness models. |
| 24 – 25 | Superior | Elite natural level. Very difficult to achieve. |
| 26+ | Exceptional | Rarely achieved naturally; often seen in pro athletes. |
Frequently Asked Questions
What is Normalized FFMI?
Normalized FFMI adjusts your score based on a standard height of 1.8 meters (5’11”). This allows for a fairer comparison between individuals of different heights, as taller people naturally tend to have higher raw FFMI scores.
How accurate is this calculator?
The accuracy depends heavily on your body fat estimate. For the best results, use a DEXA scan or professional skinfold calipers. Even with an estimate, it serves as a powerful tool for tracking muscle growth over time.
What is the natural limit?
Research suggests that most natural male athletes peak around an FFMI of 25. While genetic outliers exist, scores significantly above this often indicate the use of performance-enhancing aids.