Skinfold Body Fat Calculator
Educational body fat estimate from sum of skinfold measurements.
Use the calculator below, then review the formula, a numeric example, and the reference table to understand how the skinfold body fat estimator result is produced.
Educational tool only. It does not replace advice from a licensed clinician, dietitian, or exercise physiologist.
Calculator inputs
Result
–
What is this calculator?
Educational body fat estimate from sum of skinfold measurements. The formula, a worked example, and a reference table are below. Results are for education only, not medical advice.
How it works
Jackson–Pollock style density from sum of skinfolds (mm) and age; body fat % derived from Siri-style conversion (educational).
Example
Sum 45 mm, age 32, male page applies log-density pathway to estimate body fat %.
Reference Table
| Value | Meaning |
|---|---|
| Caliper quality | Spring calibration matters |
| Landmarks | Must match protocol sites |
| Tester skill | Training reduces error |
FAQ
Can I do this alone?
Some sites are hard to self-measure; a trained tester improves validity.
Hydration?
Skin compressibility changes slightly with fluid status.
Why differs from scale?
Consumer scales use different assumptions.
7-site vs 3-site?
This page uses a simplified educational pathway; labs may differ.