1. What is Body Fat Percentage?

Body fat percentage is the proportion of fat to total body weight. Unlike BMI, it directly measures body composition and distinguishes between fat mass and lean mass. The Navy method provides a practical way to estimate body fat using simple circumference measurements.

2. How Does the Calculator Work?

The calculator uses the U.S. Navy body fat formula:

Where:

• All measurements are in centimeters
• Waist is measured at the navel
• Neck is measured below the larynx
• Hip (women only) is measured at maximum circumference

3. Importance of Body Fat Measurement

Details: Body fat percentage provides a more accurate health assessment than BMI alone. It helps track fitness progress, assess health risks, and guide nutrition and exercise plans.

4. Using the Calculator

Tips: For accurate results, measure circumferences with a non-stretch tape measure:

• Height: Without shoes
• Waist: At navel level (men) or narrowest point (women)
• Neck: Below Adam's apple
• Hip: Widest point (women only)

5. Frequently Asked Questions (FAQ)

Q1: How accurate is the Navy method?
A: It's reasonably accurate (±3-4%) for most people when measurements are taken properly, though DEXA scans or underwater weighing are more precise.

Q2: What are healthy body fat ranges?
A: For men: 8-19% (athletes 6-13%). For women: 21-33% (athletes 14-20%). Values vary by age.

Q3: When should measurements be taken?
A: Morning before eating, after using the bathroom. Avoid measuring after exercise or when dehydrated.

Q4: Can I use inches instead of cm?
A: The formula requires cm. Convert inches to cm by multiplying by 2.54.

Q5: Why different formulas for men and women?
A: Women naturally carry more body fat, particularly in hip/thigh areas, requiring different measurement sites.