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Body Fat Formula:
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The Skinfold Body Fat Formula estimates body fat percentage using skinfold measurements. It calculates body density first, then converts it to body fat percentage using the Siri equation. This method provides a practical way to assess body composition without expensive equipment.
The calculator uses the following equations:
Where:
Explanation: The formula calculates body density from skinfold measurements and age, then converts density to body fat percentage using the established 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 programs.
Tips: Enter the sum of skinfold measurements in millimeters and age in years. Ensure skinfold measurements are taken consistently at standard sites (typically chest, abdomen, and thigh for men; triceps, suprailiac, and thigh for women).
Q1: What skinfold sites should be 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 percentages?
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%).
Q4: When should measurements be taken?
A: Ideally in the morning before eating or exercising, and consistently at the same time of day for tracking changes.
Q5: Are there limitations to this method?
A: Less accurate for extremely obese or very lean individuals, and results can vary based on the skill of the person taking measurements.