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

The Jackson-Pollock 3-site formula is a widely used method for estimating body fat percentage using skinfold measurements. It provides a practical and relatively accurate assessment of body composition when performed correctly with calipers.

2. How Does the Calculator Work?

The calculator uses the Jackson-Pollock 3-site equation for men:

Where:

• \( sum \) — Sum of chest, abdominal, and thigh skinfolds (mm)
• \( age \) — Age in years

Explanation: The equation accounts for the quadratic relationship between skinfold thickness and body fat percentage, with age as a modifying factor.

3. Importance of Body Fat Measurement

Details: Accurate body fat assessment is crucial for fitness tracking, health monitoring, and athletic performance. It provides more meaningful information than body weight alone.

4. Using the Calculator

Tips: Enter the sum of three skinfold measurements in mm (chest, abdominal, thigh), age in years, and select gender. All values must be valid (sum > 0, age between 1-120).

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this method?
A: When performed correctly, skinfold measurements can be within 3-5% of more advanced methods like DEXA scans.

Q2: What are healthy body fat ranges?
A: For men: 6-24% (athletes 6-13%, fitness 14-17%, average 18-24%). For women: 16-30% (athletes 14-20%, fitness 21-24%, average 25-30%).

Q3: Where should measurements be taken?
A: Chest (diagonal fold midway between nipple and armpit), abdominal (vertical fold 2cm right of umbilicus), thigh (vertical fold midway between knee and hip).

Q4: Are there limitations to this method?
A: Less accurate for very lean or obese individuals. Requires consistent measurement technique.

Q5: How often should measurements be taken?
A: Every 4-8 weeks to track changes, preferably at the same time of day by the same technician.