1. What is Body Fat Percentage?

Body fat percentage is the proportion of fat to total body weight. Unlike BMI, it distinguishes between fat mass and lean mass, providing a more accurate assessment of body composition.

2. How Does the Calculator Work?

The calculator uses the US Navy body fat formula:

Where:

• \( \text{waist} \) — Waist circumference at navel (cm)
• \( \text{neck} \) — Neck circumference (cm)
• \( \text{height} \) — Height (cm)
• \( \log \) — Logarithm base 10

Explanation: The equation estimates body fat based on circumference measurements, which correlate with subcutaneous fat deposits.

3. Importance of Body Fat Measurement

Details: Body fat percentage is a better health indicator than BMI alone, as it accounts for muscle mass. Healthy ranges vary by gender and age.

4. Using the Calculator

Tips: Measure waist at navel level, neck below larynx. All measurements in centimeters. For women, hip measurement would be needed for full accuracy.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this method?
A: The Navy method is reasonably accurate (±3-4%) for most people but less precise than DEXA scans or hydrostatic weighing.

Q2: What are healthy body fat ranges?
A: For men: 6-24%, women: 16-30%. Athletes typically have lower percentages.

Q3: When should measurements be taken?
A: Morning before eating, with relaxed muscles. Avoid measuring after exercise.

Q4: Why measure neck circumference?
A: Neck size helps estimate upper body leanness, improving the formula's accuracy.

Q5: How often should I check my body fat?
A: Monthly measurements are sufficient to track changes, as daily fluctuations occur.