FFMI Calculator
Fat Free Mass Index shows how much muscle you carry for your height, without counting body fat. Enter your measurements to get your score and see where it falls on the scale.
Your measurements
How to use
- Enter your height in centimeters, weight in kilograms and body fat percent.
- Choose the male or female interpretation scale.
- Press Calculate FFMI to see your score and category.
- Retest monthly to track lean muscle gains over time.
Note: The score is normalized to a height of 180 cm, which is the standard FFMI adjustment used in fitness research.
Tips
- Measure in the morning before eating for the most consistent readings.
- If your body fat number is only an estimate, the trend matters more than the exact score.
- An FFMI that rises while weight stays stable means you are gaining muscle and losing fat.
- Very high scores take years of training — be patient and keep lifting.