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Relative Fat Mass (RFM) Calculator

Estimate body fat from height and waist.

Relative fat mass (%) 22.824

Formula: RFM = 64 − 20×(height/waist) + (12 if female)

Step-by-step with your numbers:
1. Values used:
2. Height = 175
3. Waist = 85
4.
5. Relative fat mass = 22.824%
Did we solve your problem today?

RFM estimates body fat percentage from just height and waist. Informational only.

The math behind it

RFM = 64 − 20 × (height ÷ waist) + 12 for women.

Worked example

Male, 175 cm, 85 cm waist → ~22.8%.

FAQ

Why height/waist?

A relatively larger waist for your height means more body fat.

Related calculators

Body Fat Calculator Estimate body fat percentage using the U.S. Navy method. Waist to Height Ratio Calculator Find your waist-to-height ratio. Body Adiposity Index (BAI) Calculator Estimate body fat percentage from hip and height.