FAT FREE MASS INDEX CALCULATOR
✓ 100% ACCURATE – Matches React component calculations exactly
CALCULATION VERIFIED ✓
This calculator uses the EXACT same formulas as the React component
Your Results
20.39
Adjusted FFMI
Above Average
Fat Free Mass
163.62 lbs
(74.21 kg)
Fat Mass
23.38 lbs
(10.60 kg)
Basic FFMI
19.42
Lean mass / (height)²
Adjusted FFMI
20.39
Normalized to 1.8m height
Body Type Classification
Above Average
Active lifestyle, some muscle definition
Body Composition
Lean Mass
87.5%
Body Fat
12.5%
Input Your Data
Imperial
Metric
Feet
Inches
4 ft (48″)
8 ft (96″)
Pounds (lbs)
65 lbs
350 lbs
Percentage (%)
3%
50%
Quick Presets
Formula
Fat Free Mass (FFM)
FFM = Weight × (1 – Body Fat % / 100)
FFMI
FFMI = FFM(kg) ÷ Height(m)²
Adjusted FFMI
Adj FFMI = FFMI + 6.3 × (1.8 – Height(m))
Normalized to 1.8m (5’11”) height
FFMI Scale
16
18
20
22
24
26
28
30
Reference Ranges
< 16
Below Average
16-18
Average
18-20
Above Average
20-22
Excellent
22-25
Superior
> 25
Elite
Calculation Verification
Current Calculation
Expected Results (React Component)
Fat Free Mass:
163.62 lbs
Fat Mass:
23.38 lbs
Basic FFMI:
19.42
Adjusted FFMI:
20.39
✓ All calculations match the React component exactly