Skinfold Body Fat (Durnin-Womersley) Calculator
Enter your 4-site skinfold sum, age and sex to estimate body fat percent.
Result
How to use
- Enter your values in the fields above.
- Press Calculate to see your result instantly.
- Use the Share button to copy a link to your result.
About this calculator
The Durnin-Womersley equation, published in 1974, estimates body fat percentage from the sum of four skinfold measurements — biceps, triceps, subscapular, and suprailiac — taken with skinfold calipers at standardized sites. The method first calculates body density from the log of the summed skinfolds using age- and sex-specific regression coefficients, then converts that density to body fat percentage using the Siri equation (%BF = (495 ÷ density) − 450), one of the most widely validated body-composition conversion formulas.
The Durnin-Womersley 4-site protocol is one of the most commonly used skinfold methods in exercise physiology and clinical nutrition research because it requires fewer measurement sites than 7-site protocols while still correlating well with underwater weighing (hydrostatic densitometry), the gold-standard reference method it was validated against.
This calculator takes your 4-site skinfold sum, age, and sex, and returns your estimated body fat percentage using the Durnin-Womersley equation and Siri conversion.
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