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Results
Your FFMI
Fat-Free Mass
Normalized FFMI (for height > 1.8m)
Results
Results will appear here after entering your details
How to Use
- Select your preferred unit system (Metric or Imperial).
- Enter your height, weight, and current body fat percentage.
- Click the 'Calculate FFMI' button to generate your report.
- View your FFMI, Fat-Free Mass, and muscle mass category on the right.
Tips
- The accuracy of the result depends heavily on the accuracy of your body fat percentage input.
- FFMI is a key indicator for natural bodybuilding potential; the natural limit is generally considered to be around 25-26.
- A 'Normalized FFMI' is provided to allow for fair comparisons across different heights (standardized to 1.8m).
- All calculations are performed locally in your browser; your personal data is never uploaded.
Calculation Principles & Standards
FFMI (Fat-Free Mass Index) is a measurement used to determine the amount of muscle mass an individual has. Unlike BMI, FFMI accounts for body fat percentage, making it a more accurate indicator for athletes and bodybuilders.
Formula: FFMI = [Weight(kg) × (1 - Body Fat%)] / Height(m)². For individuals taller than 1.8m, we use the Normalized FFMI formula to allow for a fair comparison across different heights.
FFMI Standards (Male Reference)
| Category | FFMI Range | Description |
|---|---|---|
| Below Average | < 18 | Lower muscle mass than average |
| Average | 18 - 20 | Average for an adult male |
| Above Average | 20 - 22 | Noticeable muscular development |
| Excellent | 22 - 23 | Superior natural physique |
| Superior | 23 - 26 | Natural genetic limit or elite athlete |
| Suspicious | > 26 | Rarely achievable naturally, often indicates enhancement |
