1. What is Body Fat Percentage?

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.

2. How Does the Calculator Work?

The calculator uses the following formula:

Where:

• \( BMI \) — Body Mass Index (kg/m²)
• \( age \) — Age in years
• \( \text{gender constant} \) — 16.2 for males, 5.4 for females

Explanation: This equation estimates body fat percentage based on BMI, age, and gender, providing a quick assessment of body composition.

3. Importance of Body Fat Percentage

Details: Knowing your body fat percentage is important for assessing health risks, tracking fitness progress, and setting appropriate weight management goals. High body fat percentage is associated with increased risk of various health conditions.

4. Using the Calculator

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).

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this calculation method?
A: This formula provides a reasonable estimate but may not be as accurate as specialized methods like DEXA scans or hydrostatic weighing.

Q2: What are healthy body fat percentage ranges?
A: For men: 8-19% (athletes), 11-21% (fitness), 18-26% (acceptable); For women: 21-33% (athletes), 23-33% (fitness), 25-35% (acceptable).

Q3: Why does the formula include age?
A: Body fat percentage typically increases with age due to changes in metabolism and hormone levels, even if weight remains stable.

Q4: Can I use this calculator if I'm very muscular?
A: This formula may overestimate body fat in very muscular individuals as it doesn't account for differences in muscle mass.

Q5: How often should I measure my body fat percentage?
A: For tracking purposes, monthly measurements are sufficient as body fat changes slowly over time.