# FFMI Calc - Muscle Potential — Fat-Free Mass Index & Limits

> Fat-Free Mass Index & Limits (iPhone/iPad app by JARI TOIVIAINEN.)

- Source: https://appshunter.io/ios/app/ffmi-calc-muscle-potential/id6760226439 (this page in markdown: same URL + `.md`)
- Developer: [JARI TOIVIAINEN](https://appshunter.io/developer/1881425556)
- Category: Health & Fitness, Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 17.0 · 1 MB
- Languages: American English
- Released: 2026-03-11
- Data updated: 2026-06-05
- User reviews in markdown: https://appshunter.io/ios/app/ffmi-calc-muscle-potential/id6760226439/reviews.md

## What is FFMI Calc?

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/


## Version history (last 2 releases)

### 1.1 — 2026-04-05

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

### 1.0 — 2026-03-11

No release notes.

## More apps by JARI TOIVIAINEN

- [PumpRex — Gym Workout Tracker](https://appshunter.io/ios/app/pumprex-gym-workout-tracker/id6759879756)

All apps by JARI TOIVIAINEN: https://appshunter.io/developer/1881425556

## Related topics

[ffmi calc](https://appshunter.io/ios/topics/ffmi-calc) · [ffmi](https://appshunter.io/ios/topics/ffmi)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-05.*