1. What is Body Fat Percentage?

Body fat percentage is the proportion of fat in your body compared to your total body weight. It's a more accurate indicator of fitness than body weight alone, as it distinguishes between fat mass and lean body mass.

2. How Does the Calculator Work?

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

Where:

• \( waist \) — Waist circumference at navel (cm)
• \( neck \) — Neck circumference (cm)
• \( height \) — Height (cm)
• \( \log_{10} \) — Base-10 logarithm

Explanation: The formula estimates body fat percentage based on circumference measurements and height, using logarithmic transformations to account for non-linear relationships.

3. Importance of Body Fat Measurement

Details: Knowing your body fat percentage helps assess health risks, track fitness progress, and set appropriate weight loss or muscle gain goals. Healthy ranges vary by age and gender.

4. Using the Calculator

Tips: For accurate results:

• Measure waist at navel level after exhaling normally
• Measure neck below the larynx with tape sloping downward
• All measurements should be in centimeters
• Perform measurements in the morning before eating

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this method?
A: The Navy method is reasonably accurate (±3-4%) for most people but may be less accurate for very lean or obese individuals.

Q2: What are healthy body fat ranges?
A: For men: Essential fat 2-5%, Athletes 6-13%, Fitness 14-17%, Average 18-24%, Obese 25%+.

Q3: Is there a different formula for women?
A: Yes, the female formula includes hip measurement. This calculator is for men only.

Q4: How often should I measure body fat?
A: Every 2-4 weeks is sufficient to track changes, as daily fluctuations are normal.

Q5: What's better - calipers or this method?
A: Both have similar accuracy when done properly. Calipers require more skill but measure subcutaneous fat directly.