FFMI Calc - Muscle Potential
Fat-Free Mass Index & Limits
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
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/
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Accessibility
• VoiceOver support for the FFMI gauge – screen reader now announces the value and classification
• Dynamic Type – input fields and tables scale with the system text size
• Reduce Motion – animations respect the system motion setting across all views
Improvements
• Improved date formatting across all languages
Fixes
• Minor UI fixes and stability improvements
The developer, JARI TOIVIAINEN, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- JARI TOIVIAINEN
- Size
- 1.5 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
- iPhone
- Languages
- English
- Age Rating
9+
- 9+
- Contains
Advertising
Health or Wellness Topics
- Copyright
- © 2026 PumpRex