Jackson–Pollock 3-Site Skinfold (Men)
Chest, abdomen and thigh calipers → body density → Siri body fat: the standard male 3-site lab protocol.
With a decent caliper and consistent technique this protocol reads within ±3.5% of hydrostatic weighing. Take each fold twice on the right side, rotate through sites, and re-measure any pair differing by more than 1 mm — technique drift is the biggest error source by far.
Formula
For general information only — not medical or training advice. Estimates vary between individuals; consult a qualified professional before changing your exercise or nutrition routine.
Chest, abdomen and thigh calipers → body density → Siri body fat: the standard male 3-site lab protocol. The Jackson–Pollock 3-Site Skinfold (Men) is a free, private jackson pollock 3 site tool — every result computes instantly in your browser with no sign-up and no data upload.
About Jackson–Pollock 3-Site Skinfold (Men)
With a decent caliper and consistent technique this protocol reads within ±3.5% of hydrostatic weighing. It applies D = 1.10938 − 0.0008267·ΣS + 0.0000016·ΣS² − 0.0002574·age; BF% = 495/D − 450. Use the Jackson–Pollock 3-Site Skinfold (Men) to get an instant, clearly-explained result with the working shown step by step — free, private and with the source method cited.
How to use Jackson–Pollock 3-Site Skinfold (Men)
- 1Enter your details in the Jackson–Pollock 3-Site Skinfold (Men) input fields above.
- 2The result updates instantly with the working and reference bands shown.
- 3Adjust any value to explore how it changes the outcome — it's free and unlimited.
Why use Jackson–Pollock 3-Site Skinfold (Men)?
- ✓Instant jackson pollock 3 site result that recomputes as you type — no waiting, no page reloads
- ✓100% client-side: your health data never leaves your browser
- ✓Shows the actual formula and your numbers substituted in, so you can see exactly how the result is reached
- ✓Based on published, citable sources (Jackson AS & Pollock ML, Br J Nutr 1978;40:497-504)
- ✓Free forever with no sign-up, account or app install
Frequently asked questions
How does the Jackson–Pollock 3-Site Skinfold (Men) work?+
With a decent caliper and consistent technique this protocol reads within ±3.5% of hydrostatic weighing. The calculation uses the formula: D = 1.10938 − 0.0008267·ΣS + 0.0000016·ΣS² − 0.0002574·age; BF% = 495/D − 450. Everything runs instantly in your browser as you type — your inputs are never uploaded.
Is the Jackson–Pollock 3-Site Skinfold (Men) accurate, and what is it based on?+
The method is traceable to authoritative sources, including Jackson AS & Pollock ML, Br J Nutr 1978;40:497-504; Siri WE (1956) — body composition from fluid spaces. Results are estimates — individual variation always applies, so treat the output as a well-grounded starting point.
Is the Jackson–Pollock 3-Site Skinfold (Men) free and private?+
Yes. It's completely free with no sign-up, and all computation happens locally in your browser, so none of your health data ever leaves your device.
Can I use this for medical decisions?+
This tool is for general fitness information only, not medical or training advice. Consult a professional before changing your routine.
What can I use the Jackson–Pollock 3-Site Skinfold (Men) for?+
It's commonly used for jackson pollock 3 site, skinfold men, caliper body fat. Chest, abdomen and thigh calipers → body density → Siri body fat: the standard male 3-site lab protocol.
Related Health tools
Adult BMI Calculator (WHO)
Body-mass index for adults with the WHO reference bands shown neutrally, plus the substituted formula step by step.
● LiveBMI Calculator (lb & inches)
US-style BMI from pounds and inches using the ×703 conversion, with CDC adult reference ranges.
● LiveBMI Calculator for Women
BMI with reference context written for women — what the index can and cannot say about female body composition.
● Live