basic

Body Density via Jackson-Pollock 3-Site Calculator

Body density (and BF %) from a 3-site skinfold sum.

Estimate body density from the Jackson-Pollock 3-site skinfold equation (chest + abdomen + thigh for men; triceps + suprailiac + thigh for women) and convert to body fat % via the Siri equation.

Priya Venkatesan By Priya Venkatesan
Published Last reviewed 1 min read

Inputs

mm
yr

Results

Enter values and click Calculate to see results.
Was this helpful?

How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

Men: BD = 1.10938 − 0.0008267·Σ + 0.0000016·Σ² − 0.0002574·age. Women: BD = 1.0994921 − 0.0009929·Σ + 0.0000023·Σ² − 0.0001392·age. BF % = (495 / BD) − 450.

In depth

Estimate body density from the Jackson-Pollock 3-site skinfold equation (chest + abdomen + thigh for men; triceps + suprailiac + thigh for women) and convert to body fat % via the Siri equation.