1. What is the BMI Body Fat Percentage Formula?

The BMI-based body fat percentage formula estimates body fat using BMI, age, and gender. It provides a simple method to assess body composition without specialized equipment.

2. How Does the Calculator Work?

The calculator uses the following equation:

Where:

• \( BMI \) — Body Mass Index (kg/m²)
• \( Age \) — Age in years
• \( gender \) — 1 for male, 0 for female

Explanation: The equation accounts for the relationship between BMI and body fat percentage, adjusted for age and gender differences.

3. Importance of Body Fat Percentage

Details: Body fat percentage is a better indicator of health than BMI alone, as it distinguishes between fat mass and lean mass.

4. Using the Calculator

Tips: Enter BMI in kg/m², age in years, and select gender. All values must be valid (BMI > 0, age between 1-120).

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this formula?
A: It provides a reasonable estimate but may be less accurate for athletes or elderly individuals with significantly different body compositions.

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 does this compare to other measurement methods?
A: More accurate than BMI alone but less precise than skinfold measurements, DEXA scans, or hydrostatic weighing.

Q4: Why does gender affect the calculation?
A: Women naturally have higher essential body fat percentages than men due to biological differences.

Q5: How often should I measure my body fat percentage?
A: For tracking changes, every 4-8 weeks is sufficient as body composition changes slowly.