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Jackson-Pollock 3-Site Formula for Men:
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The Jackson-Pollock 3-site formula is a method for estimating body fat percentage using skinfold measurements at three specific sites on the body (chest, abdomen, and thigh for men). It calculates body density which is then converted to body fat percentage.
The calculator uses the Jackson-Pollock equations:
Where:
Explanation: The equation first calculates body density from skinfold measurements and age, then converts this to body fat percentage using the Siri equation.
Details: Body fat percentage provides a more accurate assessment of body composition than BMI alone. It's important for athletes, fitness enthusiasts, and health monitoring.
Tips: Enter the sum of three skinfold measurements (chest, abdomen, thigh) in millimeters and your age in years. Ensure measurements are taken properly with calipers for accurate results.
Q1: Which sites are measured for this formula?
A: For men: chest, abdomen, and thigh. For women: triceps, suprailiac, and thigh (different formula).
Q2: How accurate is skinfold measurement?
A: When performed by a trained professional, it's within 3-5% of actual body fat. Accuracy depends on proper technique and consistent measurement sites.
Q3: What are healthy body fat percentages?
A: For men: 6-24% (athletes 6-13%, fitness 14-17%, average 18-24%, obese 25%+). For women: 16-30% (higher due to essential fat needs).
Q4: When should measurements be taken?
A: Ideally in the morning before eating, with consistent timing for tracking changes. Avoid after exercise when fluids may shift.
Q5: Are there limitations to this method?
A: Less accurate for very lean or obese individuals, and those with loose skin or significant subcutaneous fat variations.