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 for males:

Where:

• \( \text{sum} \) — Sum of skinfold measurements (mm)
• \( \text{age} \) — Age in years

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

3. Importance of Body Fat Calculation

Details: Accurate body fat estimation 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 skinfold measurements in millimeters and age in years. All values must be valid (sum > 0, age between 1-120).

5. Frequently Asked Questions (FAQ)

Q1: Which skinfold sites are measured?
A: For males, the 3-site method typically measures chest, abdomen, and thigh skinfolds.

Q2: What are healthy body fat percentages?
A: For men: 6-24% is generally considered healthy, with athletes typically ranging 6-13% and average fitness 14-17%.

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 formula?
A: Accuracy may vary based on individual factors like hydration status, ethnicity, and the skill of the person taking measurements.

Q5: Should measurements be taken at specific times?
A: For consistency, take measurements at the same time of day, preferably in the morning before eating or exercising.