Durnin-Womersley Body Density Calculator

How to calculate Body Density using Durnin-Womersley?

The Durnin-Womersley method is a widely recognized protocol established in 1974 for estimating body density. It utilizes skinfold measurements from four specific anatomical sites to account for subcutaneous fat distribution across different age groups and genders.

Density = c - (m x log10(Sum of 4 Skinfolds))

Using the Body Density calculator: an example

Example: A 25-year-old male with a total skinfold sum of 45mm.

Step-by-step calculation:

1. Sum the Triceps, Biceps, Subscapular, and Suprailiac measurements
2. Identify constants 'c' and 'm' based on age and gender
3. Calculate Density using the logarithmic formula
4. Convert Density to Body Fat % using the Siri equation

Frequently Asked Questions

What are the 4 sites?
The method requires measurements from the Triceps (back of the arm), Biceps (front of the arm), Subscapular (below the shoulder blade), and Suprailiac (above the hip bone).

How accurate is this method?
When performed by a trained professional, the Durnin-Womersley method typically has a 3-5% margin of error compared to more advanced techniques like hydrostatic weighing.

Why does age matter?
Age is a critical factor because the relationship between subcutaneous fat (fat under the skin) and internal body fat changes as we age, requiring different mathematical constants for accuracy.