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Fat-Free Mass Index Calculator — result sheet
Calculate fat-free mass index from fat-free mass and height, with an optional height-normalized value.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: FFMI=fat-free mass/height metres²; normalized FFMI=FFMI+6.1×(1.8−height metres).
The index depends on the quality and definition of fat-free mass; the page reports arithmetic without grading physique or health.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Fat-free mass — minimum 1.0E-6; maximum 500
- Height — minimum 50; maximum 250
Worked example
| Input | Value |
|---|---|
| Fat-free mass | 60 |
| Height | 175 |
FFMI ≈19.592; normalized FFMI ≈19.897.
Assumptions and limits
- Fat-free mass is in kilograms and height is in centimetres.
- The supplied composition measurement and normalization convention are appropriate for the scenario.
- Age, sex, measurement method, hydration, training status, and reference population are not modeled.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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