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Body Fat Percentage Formula:
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The 3 skinfold body fat measurement is a method to estimate body fat percentage using caliper measurements at three specific sites on the body. This method provides a practical and relatively accurate way to assess body composition without expensive equipment.
The calculator uses the following equations:
Where:
Explanation: The equation first calculates body density from the sum of skinfolds and age, then converts this to body fat percentage using the Siri equation.
Details: Body fat percentage is a more accurate indicator of health and fitness than body weight alone. It helps assess health risks, track fitness progress, and guide nutrition and exercise plans.
Tips: Enter the sum of three skinfold measurements in millimeters and your age in years. Ensure measurements are taken consistently at the same sites (typically chest, abdomen, and thigh for men; triceps, suprailiac, and thigh for women).
Q1: Which three sites are measured?
A: For men: chest, abdomen, and thigh. For women: triceps, suprailiac, and thigh. Always measure on the right side of the body.
Q2: How accurate is the skinfold method?
A: When performed by a trained professional, skinfold measurements can be within 3-4% of more advanced methods like DEXA scans.
Q3: What are healthy body fat percentage ranges?
A: For men: 6-24% (athletes: 6-13%, fitness: 14-17%, average: 18-24%). For women: 16-30% (athletes: 16-20%, fitness: 21-24%, average: 25-30%).
Q4: How often should I measure?
A: Every 4-8 weeks to track changes. Avoid measuring immediately after exercise or when dehydrated.
Q5: Are there limitations to this method?
A: Less accurate for very obese individuals, older adults with loose skin, or those with significant muscle hypertrophy.