Relative Fat Mass (RFM)
Relative fat mass (Woolcott & Bergman, Sci Rep 2018) = 64 - 20 x (height / waist circumference) + 12 x sex (female = 1, male = 0); height and waist in the same units, estimating whole-body fat %.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Height
- 170 cm or in
- Waist circumference
- 90
- Sex
- Female
Result: Relative fat mass 38.2% — estimated whole-body fat.
The tool opens with these values already filled in. Replace them with your own.
What the result means
- RFM %
- 64 - 20 x (height / waist) + 12 x sex (female = 1). Estimates whole-body fat %; higher = more adiposity. An estimate, not a measured composition or a diagnosis.
What you enter
- Height
- Waist circumference (same units)
- Sex
How this is calculated
Woolcott OO, Bergman RN. Relative fat mass (RFM) as a new estimator of whole-body fat percentage. Sci Rep. 2018;8(1):10980. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.