Relative Fat Mass Index Calculator
Calculate the Relative Fat Mass (RFM) index to estimate whole-body fat percentage using only height and waist circumference.
Input Parameters
Enter details for calculation.
Relative Fat Mass
Expert Tip
RFM correlates strongly with DEXA measurements and outperforms BMI at estimating body fat percentage in most populations.
Calculation Methodology & Details
Formula
Height and waist circumference are both in cm. The formula was developed using DEXA-validated data from NHANES.
Important Disclaimer
The calculations provided are for educational and general informational purposes only. They do not replace professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider.
How RFM is Calculated
Follow these steps to use this calculator:
Select Biological Sex
RFM uses different constants for males and females.
Measure Height & Waist
Stand tall for height; measure waist at navel level.
Read RFM Result
The result approximates whole-body fat percentage.
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ℹ️ About this Calculation
This health calculator provides accurate anthropometric assessment and body composition metrics. Designed for clinical evaluation, fitness tracking, and physiological monitoring based on validated health guidelines.
Variable Glossary
Body Measurements
Height, weight, circumferences, or fold measurements recorded following standardized clinical protocols.
Anthropometric Indexes
Key physiological ratios and thresholds used to evaluate body fat distribution and medical classification.
How to Calculate Step-by-Step
Step 1
Enter your exact physical measurements into the designated fields.
Step 2
Select appropriate measurement units (Metric or Imperial) and demographic parameters if applicable.
Step 3
Review your computed index, category classification, and recommendations instantly.