Nutrition & Body Composition
Body Fat Calculator
Estimate body fat percentage with the RFM equation using height, waist circumference and sex. Read the measurement instructions and limitations.
Your estimate
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Enter your details and calculate to see your estimate, the breakdown and what to explore next.
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assumptions
An educational estimate, not a measurement or medical advice.
Behind the numbers
How this calculator works
RFM = 64 − 20 × (height ÷ waist) + 12 × sex, with male = 0 and female = 1. Height and waist use the same units.
A worked example
At 175 cm tall and an 85 cm waist, the male equation estimates 22.8% body fat.