1. What is the Jackson-Pollock 3-Site Formula?

The Jackson-Pollock 3-site formula is a method to estimate body density and body fat percentage using skinfold measurements from three specific sites on the body. It provides a practical and relatively accurate assessment of body composition.

2. How Does the Calculator Work?

The calculator uses the Jackson-Pollock formula:

Where:

• \( \text{sum} \) — Sum of three skinfold measurements (mm)
• \( \text{age} \) — Age in years
• Constants are specific to male gender

Explanation: The formula calculates body density from skinfold measurements and age, then converts it to body fat percentage using the Siri equation.

3. Importance of Body Fat Measurement

Details: Accurate body fat measurement is crucial for assessing health risks, monitoring fitness progress, and designing appropriate nutrition and exercise programs.

4. Using the Calculator

Tips: Enter the sum of three skinfold measurements in mm, age in years, and select gender. All values must be valid (sum > 0, age between 1-120). Note: This formula is specifically designed for males.

5. Frequently Asked Questions (FAQ)

Q1: Which three sites are measured?
A: The standard Jackson-Pollock 3-site method measures chest, abdomen, and thigh for males, and triceps, suprailium, and thigh for females.

Q2: What are healthy body fat percentages?
A: For men: 6-24% is generally considered healthy. For women: 16-30% is generally considered healthy. These ranges vary by age and fitness level.

Q3: How accurate is this method?
A: When performed by a trained professional, skinfold measurements can be within 3-5% of more advanced methods like DEXA scans.

Q4: Are there limitations to this method?
A: Accuracy depends on proper technique, caliper quality, and individual factors like hydration status and skin compressibility.

Q5: Can this be used for athletes?
A: Yes, but there are sport-specific equations that might be more accurate for certain athletic populations.