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

The Jackson-Pollock 3-site equation is a validated method for estimating body fat percentage using skinfold measurements at three specific sites (triceps, thigh, and suprailiac for women). It provides a practical and relatively accurate assessment of body composition.

2. How Does the Calculator Work?

The calculator uses the Jackson-Pollock equation for women:

Where:

• \( sum \) — Sum of triceps, thigh, and suprailiac skinfolds (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: Accurate body fat assessment is crucial for health monitoring, fitness progress tracking, and determining appropriate weight management strategies.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: How should skinfold measurements be taken?
A: Measurements should be taken with proper calipers by a trained professional, with the skinfold pulled away from underlying muscle and measured in millimeters.

Q2: What are typical body fat percentages for women?
A: Essential fat is 10-13%, athletes 14-20%, fitness 21-24%, average 25-31%, and obese 32%+.

Q3: When should measurements be taken?
A: Ideally in the morning before eating, with consistent timing for serial measurements. Avoid after exercise or dehydration.

Q4: Are there limitations to this method?
A: Accuracy depends on proper technique. May be less accurate for very lean or obese individuals.

Q5: How does this compare to other methods?
A: Skinfold measurements are more practical than DEXA or hydrostatic weighing but slightly less accurate. Good for tracking changes over time.