Is 7-site more accurate than 3-site?

The 7-site protocol has slightly lower standard error (~3.0% vs ~3.5% for 3-site) because it captures fat distribution across more body regions, reducing error from atypical fat patterning.

What is the sum of skinfolds used for?

The raw sum of 7 skinfolds (in mm) can also be used directly as a training tracking metric, without conversion to body fat %. This avoids the imprecision of population-based conversion equations.

How often should skinfold measurements be taken?

Monthly assessments are sufficient to track meaningful changes. Daily measurements are unreliable due to hydration-related tissue thickness variability. Consistent timing (morning, same hydration state) reduces variability.

Body Fat Jackson-Pollock 7-Site Test

Calculate body fat percentage from 7-site skinfold measurements (chest, axilla, tricep, subscapula, abdomen, suprailiac, thigh) using Jackson-Pollock generalized equations.

Use the full interactive calculator below, or

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Frequently Asked Questions

Is 7-site more accurate than 3-site?

What is the sum of skinfolds used for?

How often should skinfold measurements be taken?