Frequently Asked Questions

FFMI (Fat-Free Mass Index) is a calculation of lean muscle mass relative to height. It helps distinguish natural muscle limits from potential enhanced physique, aiding realistic goal setting and steroid detection.

FFMI 25 is shown by research to be the natural upper limit for most men. Rare genetic outliers exist, but values above 26-27 typically indicate enhanced status.

Calculators are based on peer-reviewed research and validated natural athlete data, providing probabilistic estimates. Individual variation means results are guides, not definitive predictions.

Yes, most calculators have female-specific thresholds and adjustments, reflecting different natural muscle development patterns.

The site offers a Steroid Likelihood Analyzer tool. Look for FFMI above natural limits, rapid muscle gain, and typical visual markers. Always combine assessments with context and avoid assumptions.

Models use different methods and data sets—some account for frame size, others emphasize height/weight relationships or research ceilings. Average results from multiple models give the best realistic estimate.

Genetic potential is fixed but estimates improve with better measurements. Reassess if your body composition changes significantly or every 6-12 months to track progress.

No. These tools are for educational purposes only. Always consult qualified medical/fitness professionals before making health and training decisions.