FFMI Calc - Muscle Potential

Calculate your FFMI and genetic muscular potential with science-backed formulas. Now more accessible – VoiceOver, Dynamic Type, and Reduce Motion support.

Calculate your Fat-Free Mass Index (FFMI) and discover your genetic muscle potential with scientific precision.

FFMI Calc uses the normalized FFMI formula with gender adjustment and Casey Butt's 4th edition model to estimate your maximum lean mass based on your bone structure.

Features: • FFMI & normalized FFMI calculation with gender correction • Casey Butt genetic maximum potential estimation • Body part comparison (chest, arms, legs, etc.) vs. genetic limits • Detailed PDF report with methodology • History tracking with PDF export • Supports metric (kg/cm) and imperial (lbs/in) units • Available in English, Finnish, and Spanish

All calculations run locally on your device. No account required. No data collected.

https://www.pumprex.com/ffmi-terms-of-service/ https://www.pumprex.com/ffmi-privacy-policy/