FFMI Calculator (Normalized)

Your Normalized FFMI
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💡 FFMI Reference Standards

Male Female Classification
Below 18 Below 15 Below Average (Room to grow)
18 ～ 20 15 ～ 18 Average / General level
20 ～ 22 18 ～ 20 Above Average (Trainee)
22 ～ 23.5 20 ～ 22 Excellent (Athlete level)
23.5 ～ 25 22 ～ 24 Exceptional (Natural limit)
25 & Above 24 & Above God Tier (Elite Bodybuilder)

❓ What is "Normalized" FFMI?

FFMI stands for Fat-Free Mass Index. Unlike standard BMI, it excludes body fat weight to objectively evaluate your pure muscle mass. However, the traditional formula tends to give higher scores to taller individuals. Our calculator provides the "Normalized FFMI", adjusting for height to ensure a fair evaluation regardless of stature.

🧮 FFMI Calculation Process

  1. Lean Body Mass (LBM):
    Weight × (1 - Body Fat % ÷ 100)
  2. Standard FFMI:
    Lean Body Mass ÷ Height (m)²
  3. Height Correction (Normalized):
    Standard FFMI + 6.1 × (1.8 - Height (m))

📱 Tired of manual logging?

The iOS version seamlessly integrates with Apple Watch and HealthKit. Track weight and body fat trends to automatically manage your precise FFMI changes with beautiful charts.

➔ Download iOS Version

🧬 Scientific References

The standard and normalized FFMI calculations and classifications used here are based on the following peer-reviewed research:
• Kouri EM, et al. "Fat-free mass index in users and nonusers of anabolic-androgenic steroids." Clin J Sport Med. 1995. ➔ View paper on PubMed (PMID: 7552983)