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Durnin & Womersley Body Fat Calculator

Estimate your body-fat percentage from four upper-body skinfold measurements using the established Durnin & Womersley method. Enter your age, sex, body weight and four skinfold measurements to estimate body fat, fat mass and lean mass.

1

Age

years
Enter your age in completed years.
2

Sex

The Durnin & Womersley equations use different coefficients by sex.
3

Body weight

kg
Used to estimate your fat mass and lean mass after body-fat percentage is calculated.
4

Biceps skinfold

mm
Measure the biceps skinfold according to standard skinfold technique.
5

Triceps skinfold

mm
Measure the triceps skinfold according to standard skinfold technique.
6

Subscapular skinfold

mm
Measure the skinfold below the shoulder blade.
7

Suprailiac skinfold

mm
Measure the skinfold above the iliac crest according to standard technique.

Your estimated body-fat percentage:

0%

Your result is calculated from the four skinfold measurements using the age- and sex-specific Durnin & Womersley equations.

Durnin & Womersley Body Fat Calculator Result

0%
body fat
0
body density
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This calculator provides an informational estimate and is not medical or health advice. Results can vary depending on measurement technique and individual factors. If you have a medical condition or concerns about body composition, consult a qualified healthcare professional.
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How Does the Durnin & Womersley Body Fat Calculator Work?

The Durnin & Womersley Body Fat Calculator estimates body-fat percentage from four upper-body skinfold measurements: biceps, triceps, subscapular and suprailiac. The Durnin & Womersley method uses age- and sex-specific equations to estimate body density from the logarithm of the combined skinfold thickness. The estimated body density is then converted into body-fat percentage using the Siri equation.

Term What does it mean? In the calculation Why does it matter?
Skinfold sum The combined thickness of the biceps, triceps, subscapular and suprailiac skinfolds. Biceps + triceps + subscapular + suprailiac The four measurements provide the primary input used by the Durnin & Womersley body-density equations.
Age group The age range into which the person falls. Age-specific coefficients The original equations use different coefficients for different age groups because the relationship between skinfold thickness and body density changes with age.
Sex The sex-specific equation selected for the calculation. Male or female equation Durnin & Womersley published different coefficients for men and women.
Body density An estimated measure of the density of the body's tissues. g/cm³ Body density is the intermediate value used before converting the estimate into body-fat percentage.
Body-fat percentage The estimated percentage of total body weight represented by fat mass. Siri equation This provides the final body-composition estimate from the calculated body density.

1. Measure four skinfolds

The method requires measurements at the biceps, triceps, subscapular and suprailiac sites. The measurements should be taken in millimeters using a skinfold caliper and consistent technique.

2. Estimate body density

The four measurements are added together and the base-10 logarithm of the total is used in the appropriate Durnin & Womersley equation for the person's age group and sex.

3. Convert density to body fat

The estimated body density is converted into body-fat percentage using the Siri equation. Body weight is then used to estimate fat mass and lean mass in kilograms.

Durnin & Womersley:
Body density = age- and sex-specific coefficient − coefficient × log₁₀(four-skinfold sum)

Siri equation:
Body fat % = (495 ÷ body density) − 450

Fat mass:
Body weight × body-fat % ÷ 100

Lean mass:
Body weight − fat mass

The Durnin & Womersley method is an estimation method, not a direct measurement of body composition. Results can be affected by skinfold-site identification, caliper technique, tester experience, hydration and individual differences. For the most useful comparisons over time, use the same measurement sites, equipment and technique consistently.

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Fitness Calculators
Durnin & Womersley Body Fat Calculator

Durnin & Womersley Body Fat Calculator estimates body-fat percentage from four upper-body skinfold measurements: biceps, triceps, subscapular and suprailiac. It uses the original age- and sex-specific Durnin & Womersley equations to estimate body density, then applies the Siri equation to estimate body fat. Enter your body weight as well to estimate fat mass and lean mass in kilograms

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 the Durnin & Womersley Body Fat Calculator?

The Durnin & Womersley Body Fat Calculator estimates body-fat percentage using four skinfold measurements. It combines biceps, triceps, subscapular and suprailiac measurements with your age and sex. The method first estimates body density and then converts that value into an estimated body-fat percentage.

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How accurate is the Durnin & Womersley method?

The Durnin & Womersley method can provide a useful body-composition estimate when the skinfold measurements are taken correctly and consistently. Its accuracy depends heavily on finding the correct anatomical sites and using proper caliper technique. It is best used for tracking changes over time rather than treating a single result as an exact measurement of body fat.

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How do you measure the four Durnin & Womersley skinfolds?

The method uses the biceps, triceps, subscapular and suprailiac skinfolds, measured in millimeters. A skinfold caliper is used to measure the thickness of the pinched fold of skin and underlying subcutaneous tissue at each site. Consistent positioning, technique and measurement conditions are important when comparing results between different dates.

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What formula does the Durnin & Womersley Body Fat Calculator use?

The Durnin & Womersley method estimates body density from the base-10 logarithm of the combined four-skinfold measurement. The coefficients change according to age group and sex, which is why those details are required by the calculator. The estimated body density is then converted into body-fat percentage using the Siri equation.

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Can you calculate fat mass and lean mass from body-fat percentage?

Yes. Once estimated body-fat percentage is known, body weight can be used to estimate the amount of fat mass in kilograms. Fat mass is calculated by multiplying body weight by body-fat percentage, while estimated lean mass is body weight minus fat mass. These values are estimates because they depend on the accuracy of the original body-fat calculation.

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Why should you track body-fat percentage instead of body weight alone?

Body weight does not show how much of your weight comes from fat mass versus lean tissue. Tracking estimated body-fat percentage alongside body weight can provide additional context when your goal is fat loss, muscle building or body-composition change. For the most useful trend, measure under similar conditions and focus on changes over time rather than small differences between individual measurements.

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