Health

Relative Fat Mass (RFM) Calculator

Estimate body fat from height and waist.

Sex

Height

Waist

Calculated Output

Relative fat mass (%) 22.824

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

Step-by-Step Breakdown

1. Values used:

2. Height = 175

3. Waist = 85

5. Relative fat mass = 22.824%

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The math behind it

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

Male, 175 cm, 85 cm waist → ~22.8%.

Why height/waist?

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