Relative Fat Mass (RFM) Calculator
Get an estimate of your body fat percentage from just your height and waist measurements. A better formula than BMI — a measuring tape is all you need.
RFM formula: Men: 64 − (20 × height ÷ waist) | Women: 76 − (20 × height ÷ waist). Height and waist must both be in the same unit.
Stand straight and measure from head to foot.
Wrap the tape around your waist and breathe out.
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Estimated body fat (RFM)
This is an estimate, not medical advice. See a doctor for medical decisions.
RFM Categories (estimate)
| Category | Men | Women |
|---|---|---|
| Low | < 18% | < 25% |
| Healthy | 18–24% | 25–32% |
| Overweight | 25–29% | 33–38% |
| Obese | ≥ 30% | ≥ 39% |
How to use
- Select gender and unit.
- Enter your height and waist (at belly button level).
- Press "Calculate" to see your body fat % and category.