To calculate the body fat percentage as per the Durnin-Womersley approach, you should follow these steps:
Measure the tricep, bicep, subscapular, and suprailiac skinfolds in millimeters, using the caliper.
Calculate the log of the sum of skinfolds.
Calculate body density by multiplying the log of the sum of skinfolds by 0.0717, and subtracting the computed number from 1.1599.
Divide 495 by the number calculated in Step 3 (body density), and substruct 450.
That's all! You have calculated the body fat percentage.
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