FFMI Calc
Muscle Index Calc
Free · Designed for iPad. Not verified for macOS.
■ Main Features
Instant FFMI & Normalized FFMI Calculation
Simply enter your height, weight, and body fat percentage to instantly calculate your Fat-Free Mass Index (FFMI) and "Normalized FFMI," which adjusts for height differences to ensure a fair evaluation.
[NEW] Target FFMI Reverse Simulator
"What changes do I need to make to reach a Normalized FFMI of 22?"
Just set your target value, and the app automatically generates a "Body Fat % and Target Weight combination list" based on your height. It strongly supports your specific goal setting, from bulking up to cutting, by factoring in body fat fluctuations.
Classification Rank Display
Based on your calculated values, it provides intuitive feedback on where your muscle mass ranks, from below average up to the "God-like" level.
Global Support
Full compatibility with both Metric (cm/kg) and Imperial (ft/lbs) systems. It also supports multiple languages (Japanese, English, Korean, Traditional Chinese, and German).
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Optimized the UI display.
The developer, Tomoharu Iseki, 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
- Tomoharu Iseki
- Size
- 1.1 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 26.4 or later.
- iPhone
Requires iOS 26.4 or later. - iPad
Requires iPadOS 26.4 or later. - Mac
Requires macOS 26.4 or later and a Mac with Apple M1 chip or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Tomoharu Iseki