Free tool
Jackson Pollock
Body Fat Calculator.
The Jackson-Pollock skinfold method is one of the most reliable field tests for measuring body fat percentage. Used by personal trainers and fitness professionals worldwide, it accounts for sex, age, and multiple measurement sites for a more accurate result than single-site or BMI-based methods.
Measurement guide
The 7 skinfold sites
For the 3-site method, men measure chest, abdomen, and thigh. Women measure tricep, suprailiac, and thigh.
Reference
Body fat categories (ACE)
| Category | Men | Women |
|---|---|---|
| Essential fat | 2–5% | 10–13% |
| Athletic | 6–13% | 14–20% |
| Fitness | 14–17% | 21–24% |
| Acceptable | 18–24% | 25–31% |
| Obese | 25%+ | 32%+ |
Source: American Council on Exercise (ACE). Ranges are general guidelines and should be contextualised by a qualified professional.
What is the Jackson-Pollock method?
The Jackson-Pollock skinfold technique was developed by Andrew S. Jackson and Michael L. Pollock in 1978 and remains one of the most widely used field methods for estimating body fat percentage. It works by measuring the thickness of subcutaneous fat at specific sites using a skinfold calliper. Those measurements are entered into a validated regression equation — which accounts for sex and age — to calculate body density. Body fat percentage is then derived using the Siri equation: % Body Fat = (495 ÷ Body Density) − 450.
The 7-site protocol is the more comprehensive of the two methods offered here. By including seven measurement sites rather than three, it reduces the margin of error and provides a more complete picture of fat distribution across the body. The 3-site method is faster and still useful for tracking trends — it is particularly well-suited to regular re-testing where consistency of technique matters more than absolute accuracy.
How accurate is skinfold testing?
When performed correctly by a trained assessor using calibrated calipers, the Jackson-Pollock method has a standard error of approximately 3–4% compared to hydrostatic weighing. That accuracy depends heavily on consistent technique — same assessor, same time of day, and the same conditions each time. Factors such as skin hydration, muscle tension, and calliper quality can all affect the reading.
For the executives and professionals Andrew trains at EFC in Marylebone, skinfold testing is one part of a broader assessment that includes strength baselines, cardiovascular markers, and lifestyle factors. The number matters less than the trend — consistent re-testing every 8–12 weeks gives a reliable picture of whether body composition is moving in the right direction.
Why body fat percentage matters more than weight
Body weight alone tells you very little. Two people at the same weight can have dramatically different body compositions — one predominantly muscle, one predominantly fat. Tracking body fat percentage gives you a far clearer picture of your physique, your health risk profile, and whether your training and nutrition are actually working.
For executives, the practical implication is straightforward: a reduction in body fat — particularly visceral fat — has a direct, measurable impact on energy levels, cognitive performance, cardiovascular health, and how you present yourself professionally. It is one of the highest-return investments you can make in your personal performance. Explore online coaching options or elite in-person training if you want structured support reaching your targets.
FAQ
Common questions
What is the Jackson Pollock 7-site skinfold test?
The Jackson-Pollock 7-site skinfold test measures subcutaneous body fat at seven specific sites on the body using calipers. The measurements are entered into a validated equation that accounts for sex and age to calculate body density, which is then converted to a body fat percentage using the Siri equation.
What is the difference between the 7-site and 3-site Jackson-Pollock method?
The 7-site method measures chest, midaxillary, tricep, subscapular, abdomen, suprailiac, and thigh and is more accurate. The 3-site method uses chest, abdomen, and thigh for men, or tricep, suprailiac, and thigh for women — it is faster and still reliable for tracking trends over time.
How accurate is the Jackson-Pollock body fat calculator?
When performed correctly by a trained professional using calibrated calipers, the Jackson-Pollock method has a margin of error of approximately 3–4%. Accuracy depends on consistent technique, site location, and taking measurements under the same conditions each time.
What is a healthy body fat percentage?
For men, fitness-range body fat is generally 14–17%, with athletic levels at 6–13%. For women, fitness-range is 21–24% and athletic is 14–20%. These ranges vary by age and individual goal — an executive personal trainer can help you identify the right target for your physique and performance objectives.
For personal trainers
Track every client's body composition over time
This calculator is a useful starting point. BOS is the full assessment platform — designed for fitness professionals who want to log skinfold results, track client progress, and generate professional reports without the spreadsheet admin.
Learn about BOSFor executives
Know your numbers. Then do something about them.
Andrew Meyer is a Strength and Conditioning Level 4 coach with 20 years of experience training FTSE directors and C-suite leaders in Marylebone. Book a full assessment — skinfolds, strength, cardiovascular baseline — and get a training plan built around your results.