1. What is the 3-Site Body Density Test?

The 3-site body density test is a method to estimate body composition by measuring skinfold thickness at three specific body locations. It provides an estimate of body density which can be used to calculate body fat percentage.

2. How Does the Calculator Work?

The calculator uses the 3-site body density equation:

Where:

• \( BD \) — Body Density (g/cm³)
• \( S \) — Sum of skinfolds (mm)
• \( A \) — Age in years

Explanation: The equation accounts for the relationship between skinfold thickness, age, and body density, with quadratic terms for more accurate estimation.

3. Importance of Body Density Measurement

Details: Body density measurement is crucial for assessing body composition, tracking fitness progress, and determining health risks associated with body fat levels.

4. Using the Calculator

Tips: Enter the sum of skinfold measurements in mm 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: The three sites typically measured are chest, abdomen, and thigh for men, and triceps, suprailiac, and thigh for women.

Q2: What are normal body density values?
A: Typical values range from 1.020-1.100 g/cm³, with higher values indicating leaner body composition.

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

Q4: Are there limitations to this equation?
A: Accuracy may be reduced in extremely lean or obese individuals, and in populations different from those used to develop the equation.

Q5: Can I use this for athletic populations?
A: While useful, sport-specific equations may provide better accuracy for highly trained athletes.