Durnin And Womersley Skinfold Calculator

Durnin and Womersley Formula:

\[ \log S = \log (Triceps + Biceps + Subscap + Suprailiac) \]

Triceps (mm):

Biceps (mm):

Subscap (mm):

Suprailiac (mm):

Age:

years

Gender:

Body Fat Percentage:

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1. What is the Durnin and Womersley Formula?

The Durnin and Womersley formula is a method for estimating body fat percentage using skinfold measurements at four sites (triceps, biceps, subscapular, and suprailiac). It's widely used in clinical and research settings for body composition assessment.

2. How Does the Calculator Work?

The calculator uses the Durnin and Womersley equation:

\[ \log S = \log (Triceps + Biceps + Subscap + Suprailiac) \]

Where:

\( Triceps \) — Triceps skinfold thickness (mm)
\( Biceps \) — Biceps skinfold thickness (mm)
\( Subscap \) — Subscapular skinfold thickness (mm)
\( Suprailiac \) — Suprailiac skinfold thickness (mm)

Explanation: The sum of skinfolds is log-transformed and used with age- and sex-specific equations to estimate body density, which is then converted to body fat percentage using the Siri equation.

3. Importance of Body Fat Measurement

Details: Accurate body fat assessment helps evaluate health risks, monitor fitness progress, and guide nutrition and exercise programs. Excess body fat is associated with numerous health conditions.

4. Using the Calculator

Tips: Enter skinfold measurements in millimeters, age in years, and select gender. All skinfold values must be greater than 0, and age must be between 17-120 years.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is the Durnin and Womersley method?
A: It provides reasonable estimates (±3-5% of actual body fat) when measurements are taken properly by trained professionals.

Q2: What are normal body fat percentages?
A: For men: 8-19% (athletes), 20-24% (fitness), 25%+ (overweight). For women: 21-33% (athletes), 24-30% (fitness), 31%+ (overweight).

Q3: How should skinfold measurements be taken?
A: Measurements should be taken on the right side of the body with calipers, with the skinfold pulled away from underlying muscle.

Q4: Are there limitations to this method?
A: Less accurate for very lean or obese individuals, and results can vary based on the skill of the technician taking measurements.

Q5: How often should body fat be measured?
A: For tracking changes, every 4-8 weeks is sufficient as body composition changes slowly over time.