1. What is the Jackson-Pollock 4-site Formula?

The Jackson-Pollock 4-site formula is a skinfold measurement method that estimates body fat percentage by measuring skinfold thickness at four specific body locations. It provides a practical and relatively accurate assessment of body composition.

2. How Does the Calculator Work?

The calculator uses the Jackson-Pollock 4-site equation for men:

Where:

• \( sum \) — Sum of 4 skinfold measurements (mm)
• \( age \) — Age in years

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

3. Importance of Body Fat Measurement

Details: Body fat percentage is a key indicator of health and fitness. It helps assess obesity risk, track fitness progress, and guide nutrition and training programs.

4. Using the Calculator

Tips: Enter the sum of four skinfold measurements (chest, abdomen, thigh, and triceps) in millimeters, age in years, and select gender. Currently only the male formula is implemented.

5. Frequently Asked Questions (FAQ)

Q1: Which skinfold sites are measured?
A: The four sites are chest, abdomen, thigh, and triceps for men.

Q2: How accurate is this method?
A: When performed correctly by an experienced technician, it's within 3-5% of more advanced methods like DEXA.

Q3: When should measurements be taken?
A: Ideally in the morning, before exercise, and consistent timing for serial measurements.

Q4: Are there limitations to this method?
A: Less accurate for very lean or obese individuals, and requires proper technique.

Q5: What are healthy body fat percentages?
A: For men: 6-24% (athletes 6-13%, fitness 14-17%, average 18-24%, obese 25%+).