Ffmi Calculator
Calculate your Fat-Free Mass Index (FFMI) to estimate your muscle mass relative to height, useful for fitness and bodybuilding assessment.
Published by:
isCalculator Editorial Team
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How to use this tool?
How to Use the FFMI Calculator
This calculator estimates your Fat-Free Mass Index (FFMI), a measure of lean muscle mass relative to height. It also provides an adjusted FFMI for better accuracy.
- Step 1: Enter your Weight (kg) – use metric system only (kilograms).
- Step 2: Enter your Height (cm) – in centimeters (e.g., 175).
- Step 3: Enter your Body Fat (%) – a percentage between 0 and 100 (e.g., 15).
- Step 4: Click "Calculate FFMI".
Results: You'll see your adjusted FFMI (kg/m²) and a category:
- Below average (<18)
- Average (18–19.9)
- Above average (20–21.9)
- Excellent (22–24.9)
- Exceptional (≥25, may indicate steroid use)
Note: All inputs must be positive numbers. Body fat must be less than 100%.
Previous Results
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Frequently Asked Questions
FFMI stands for Fat-Free Mass Index, a measure of muscle mass relative to height, used to assess physique development.
FFMI = (Weight * (1 - Body Fat%)) / (Height^2) * 10000. An adjusted FFMI accounts for height differences.
Normal FFMI ranges: Below 18 (below average), 18-20 (average), 20-22 (above average), 22-25 (excellent), above 25 (exceptional, possibly steroid use).
