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RFM Body Fat Calculator

Estimate your body fat percentage using the Relative Fat Mass (RFM) formula based on your height and waist circumference.

1

What is your sex?

2

How tall are you?

ft in
3

What is your waist circumference?

in
4

Your body weight (optional)

lb

Body weight is not part of the RFM formula, so it is not required for the calculation.

Your Estimated Body Fat

0.0%
estimated body fat percentage
-
0 in
height
0 in
waist circumference
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How Does the RFM Calculator Calculate Body Fat?

RFM, or Relative Fat Mass, is a simple body composition estimation method that uses the ratio between height and waist circumference to estimate body fat percentage. One advantage of the method is that it does not require body weight or specialized measuring equipment.

Input What the Formula Uses Why It Is Needed
Sex Male or female The RFM formula uses a different equation for males and females.
Height Feet/inches or centimeters Height is combined with waist circumference to calculate the body proportion used by the RFM equation.
Waist circumference Inches or centimeters Waist circumference is compared with height to estimate relative fat mass.
Body weight Not required Body weight is not part of the original RFM equation, so it is not needed for the calculation.
RFM result Percentage (%) The final result represents the estimated body fat percentage.

The RFM Formula

The RFM method was developed by Orison Woolcott and Richard N. Bergman. Published in 2018, the method estimates body fat percentage using the relationship between height and waist circumference.

Men: RFM = 64 − 20 × (height ÷ waist circumference) Women: RFM = 76 − 20 × (height ÷ waist circumference) Important: Height and waist circumference must use the same unit.
Example Calculation

For a man who is 5 ft 9 in tall with a 33.5 in waist, the RFM formula uses 64 − 20 × (height ÷ waist circumference). This produces an estimated body fat percentage of approximately 22.8%.

Why Doesn't RFM Use Body Weight?

Body weight does not appear in the original RFM equation. Instead, the method uses the relationship between height and waist circumference to estimate body fat percentage. This means two people with the same body weight can have different RFM results if their height or waist circumference differs.

RFM vs. Direct Body Fat Measurement

RFM is an estimation method rather than a direct measurement of body fat. Results can differ from methods such as DEXA, skinfold measurements, bioelectrical impedance analysis, or other body composition techniques.

Calculator results are for informational purposes only and are not medical advice or a substitute for professional body composition assessment.

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Fitness Calculators
RFM Body Fat Calculator

RFM calculator estimates your body fat percentage using your height and waist circumference. Relative Fat Mass, or RFM, does not require your body weight and uses a sex-specific equation to estimate body fat from your body proportions.

Medical Disclaimer: The calculator results and information provided in this article are for educational and informational purposes only and do not constitute medical, health, or professional advice. Always consult with a qualified healthcare provider before making any decisions related to your health, diet, or fitness goals. Individual results may vary, and this tool should not be used to diagnose or treat any medical condition.

What Is RFM, or Relative Fat Mass?

RFM, or Relative Fat Mass, is a simple method for estimating body fat percentage. It uses the relationship between your height and waist circumference rather than relying on body weight or BMI. The result provides an estimate of your relative body fat that can be useful for general fitness tracking.

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How Does the RFM Formula Calculate Body Fat?

The RFM formula uses different equations for males and females. For men, the equation is 64 − 20 × (height ÷ waist circumference), while for women it is 76 − 20 × (height ÷ waist circumference). Height and waist circumference must be entered using the same unit, such as both measurements in inches or centimeters.

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Who Created the RFM Formula?

The Relative Fat Mass method was developed by Orison Woolcott and Richard N. Bergman. Their research introduced RFM as a simple way of estimating body fat without requiring body weight or BMI. The method was published in 2018 and uses height and waist circumference as its primary measurements.

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Why Doesn't the RFM Calculator Need Your Weight?

Body weight is not included in the original RFM equation. Instead, the calculation uses the ratio between height and waist circumference to estimate relative fat mass. This means two people who weigh exactly the same amount can still receive different RFM estimates if their height or waist circumference differs.

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How Accurate Is the RFM Calculator?

RFM is an estimation method rather than a direct measurement of body fat. Individual results can vary depending on factors such as body shape, fat distribution, and how accurately waist circumference is measured. For this reason, RFM is best viewed as a useful estimate or tracking tool rather than a diagnostic measurement.

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How Can You Reduce Body Fat Percentage?

Reducing body fat generally requires maintaining a sustainable calorie deficit over time. Adequate protein intake and resistance training can help support muscle retention during fat loss, while increasing daily activity can contribute to overall energy expenditure. Consistent, manageable changes are generally easier to maintain than extreme dieting approaches.

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