What is FFMI
FFMI stands for fat free body mass index with which you can calculate the amount of muscle mass
relative to height. This index used by bodybuilders to compare themselves to others.
Also FFMI is a an alternative to body mass index.
FFMI formula
Total Body Fat = Weight * (body fat [%] / 100)
Lean Weight = Weight * (1 - (body fat [%] / 100)
FFMI = (Lean Weight / 2.2) / ((Feet * 12.0 + Inches) * 0.0254)2
Adjusted FFMI = FFMI + ( 6.3 * (1.8 - (Feet * 12.0 + Inches) * 0.0254))
FFMI interpretation
The calculated normalized ffmi can be interpreted using the tables below. You also need to consider that the interpretation for men and women will be different, so there are 2 tables.
FFMI score 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 score 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 |
How to use calculator
To estimate your FFMI, complete the following simple steps:
- Choose the measurement system (imperial or metric)
- Enter your height
- Enter your weight
- Enter your body fat percentage
- Click the "Calculate" button to get the results.