FFMI Calculator
Calculate your Fat-Free Mass Index (FFMI) to measure muscle mass relative to height and compare yourself to others.
Your Results
FFMI (Fat-Free Mass Index)
Normalized FFMI
Fat-Free Mass
Body Fat Mass
Interpretation
Category:
FFMI Interpretation for Men
| FFMI | Body Fat | Description |
|---|---|---|
| 17-18 | 10-18% | Skinny man |
| 18-20 | 20-27% | Average man |
| 19-21 | 25-40% | Fat man |
| 20-21 | 10-18% | Athlete / Intermediate gym user |
| 22-23 | 6-12% | Advanced gym user |
| 24-25 | 8-20% | Bodybuilder / Powerlifter / Weightlifter |
FFMI Interpretation for Women
| FFMI | Body Fat | Description |
|---|---|---|
| 14-15 | 20-25% | Skinny women |
| 14-17 | 22-35% | Average women |
| 15-18 | 30-45% | Fat women |
| 16-17 | 18-25% | Athlete / Intermediate gym user |
| 18-20 | 15-22% | Advanced gym user |
| 19-21 | 15-30% | Bodybuilder / Powerlifter / Weightlifter |
Fat-Free Mass Index (FFMI) Calculator
What is FFMI?
FFMI (Fat-Free Mass Index) is a sophisticated measurement tool that calculates muscle mass relative to height. Unlike the traditional BMI, FFMI provides a more accurate assessment for bodybuilders, athletes, and fitness enthusiasts to compare their muscular development.
FFMI Formula Explained
The FFMI calculation involves several steps:
- Total Body Fat = Weight × (body fat % ÷ 100)
- Lean Weight = Weight × (1 - (body fat % ÷ 100))
- FFMI = (Lean Weight ÷ 2.2) ÷ ((Height in feet × 12 + inches) × 0.0254)²
- Adjusted FFMI = FFMI + (6.3 × (1.8 - (Height in feet × 12 + inches) × 0.0254))
FFMI Score Interpretation
For Men
| FFMI Range | Body Fat % | Description |
|---|---|---|
| 17-18 | 10-18% | Skinny man |
| 18-20 | 20-27% | Average man |
| 19-21 | 25-40% | Fat man |
| 20-21 | 10-18% | Athlete / Intermediate gym user |
| 22-23 | 6-12% | Advanced gym user |
| 24-25 | 8-20% | Bodybuilder / Powerlifter / Weightlifter |
For Women
| FFMI Range | Body Fat % | Description |
|---|---|---|
| 14-15 | 20-25% | Skinny women |
| 14-17 | 22-35% | Average women |
| 15-18 | 30-45% | Fat women |
| 16-17 | 18-25% | Athlete / Intermediate gym user |
| 18-20 | 15-22% | Advanced gym user |
| 19-21 | 15-30% | Bodybuilder / Powerlifter / Weightlifter |
How to Use Our FFMI Calculator
- Select your preferred measurement system (imperial or metric)
- Enter your height
- Input your current weight
- Provide your body fat percentage
- Click "Calculate" to see your results
Why Choose Our FFMI Calculator?
- Accurate calculations using the standard FFMI formula
- Includes adjusted FFMI for more precise results
- Comprehensive interpretation tables for both men and women
- Easy-to-use interface with instant results
- Free tool with no registration required
- Mobile-friendly design
Disclaimer: This calculator is provided for educational and informational purposes only. Always consult with healthcare professionals or fitness experts for personalized advice.
Scientific References & Further Reading
Research Papers and Studies
- Research Paper: Fat-free mass index in users and nonusers of anabolic-androgenic steroids - PubMed Study
- Scientific Article: Body Composition Assessment Methods - Science Direct
Related Tools and Resources
Manish is a NASM-certified fitness and nutrition coach with over 10 years of experience in weight lifting and fat loss fitness coaching. He specializes in gym-based training and has a lot of knowledge about exercise, lifting technique, biomechanics, and more.
Through “Fit Life Regime,” he generously shares the insights he’s gained over a decade in the field. His goal is to equip others with the knowledge to start their own fitness journey.