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Body Fat Percentage Formula:
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Body fat percentage is the total mass of fat divided by total body mass, multiplied by 100. It provides a more accurate assessment of body composition than body weight alone, as it distinguishes between fat mass and lean body mass.
The calculator uses the skinfold measurement formula:
Where:
Explanation: This equation estimates body density from skinfold measurements, which is then converted to body fat percentage using the Siri equation.
Details: Monitoring body fat percentage is crucial for assessing health risks, tracking fitness progress, and developing appropriate nutrition and exercise plans. High body fat percentage is associated with increased risk of various health conditions.
Tips: Enter the sum of skinfold measurements in millimeters, age in years, and select gender. For accurate results, skinfold measurements should be taken by a trained professional using calipers at standard sites (typically chest, abdomen, and thigh for men; triceps, suprailiac, and thigh for women).
Q1: How accurate is the skinfold method?
A: When performed by a trained professional, skinfold measurements can be within 3-4% accuracy compared to more advanced methods like DEXA scans.
Q2: 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: 14-20%, fitness: 21-24%, average: 25-30%).
Q3: How often should I measure my body fat?
A: Every 4-8 weeks is sufficient to track changes, as significant fat loss or gain takes time to occur.
Q4: Are there limitations to this method?
A: Accuracy can be affected by the skill of the measurer, hydration status, and individual variations in fat distribution.
Q5: Should I use this method if I'm obese?
A: Skinfold measurements may be less accurate for individuals with very high body fat percentages. Other methods like circumference measurements or bioelectrical impedance may be more appropriate.