1. What is Body Fat Percentage?

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 weight or 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:

• \( \text{BMI} \) — Body Mass Index (weight in kg / height in m²)
• \( \text{age} \) — Age in years
• \( \text{sex} \) — 1 for male, 0 for female

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

3. Importance of Body Fat Measurement

Details: Monitoring body fat percentage is important for health assessment, fitness tracking, and weight management. High body fat percentage is associated with increased health risks, while very low levels can also be problematic.

4. Using the Calculator

Tips: Enter weight in kilograms, height in centimeters, age in years, and select your gender. All values must be valid (weight > 0, height > 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 more advanced methods like DEXA scans or hydrostatic weighing.

Q2: What are healthy body fat percentage ranges?
A: For men: 8-19% (athletic), 20-24% (fitness), 25%+ (obese). For women: 21-33% (athletic), 34-39% (fitness), 40%+ (obese).

Q3: Why does the formula include age?
A: Body composition changes with age, typically showing increased fat mass and decreased muscle mass as people get older.

Q4: Are there limitations to this equation?
A: This formula may be less accurate for athletes, elderly individuals, and those with unusual body compositions.

Q5: How often should I measure my body fat percentage?
A: For most people, measuring every 4-8 weeks is sufficient to track changes without becoming obsessive about daily fluctuations.