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Body Fat Percentage Formula:
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Body Fat Percentage (BFP) is the total mass of fat divided by total body mass, multiplied by 100. It provides a more accurate assessment of body composition than BMI alone, as it distinguishes between fat mass and lean body mass.
The calculator uses the following formula:
Where:
Explanation: This formula estimates body fat percentage using BMI and age, with adjustments for gender differences in body composition.
Details: Knowing your body fat percentage is important for assessing health risks, tracking fitness progress, and creating targeted nutrition and exercise plans. High body fat percentage is associated with increased risk of various health conditions.
Tips: Enter your BMI in kg/m², age in years, and select your gender. All values must be valid (BMI > 0, age between 1-120). For accurate results, ensure your BMI calculation is based on accurate height and weight measurements.
Q1: How accurate is this calculation method?
A: This formula provides a reasonable estimate but may not be as accurate as methods like DEXA scans or hydrostatic weighing. It's best used for general guidance rather than precise measurement.
Q2: What are healthy body fat percentage ranges?
A: For men: 8-19% (athletes), 20-25% (acceptable), >25% (obese). For women: 21-33% (athletes), 34-39% (acceptable), >39% (obese).
Q3: Why does the formula use different constants for males and females?
A: Women naturally have higher essential body fat percentages due to physiological differences including reproductive functions and hormonal variations.
Q4: Can I use this calculator if I'm pregnant?
A: No, this calculator is not suitable for pregnant women as pregnancy significantly alters body composition.
Q5: How often should I check my body fat percentage?
A: For most people, checking every 4-8 weeks is sufficient to track changes without becoming obsessive about daily fluctuations.