1. What is Body Fat Percentage?

Body fat percentage is the proportion of fat to total body weight. This calculator uses the U.S. Navy body fat formula, which provides a reliable estimate based on circumference measurements.

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)

Explanation: The formula accounts for the relationship between body circumferences and fat distribution, using logarithmic transformations for better accuracy.

3. Importance of Body Fat Measurement

Details: Knowing your body fat percentage helps assess health risks, track fitness progress, and set appropriate weight management goals more accurately than BMI alone.

4. Using the Calculator

Tips: For accurate results:

• Measure waist at navel level after normal exhalation
• Measure neck below the larynx with tape sloping downward
• All measurements should be in centimeters

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this method?
A: The Navy method is about ±3% accurate compared to more advanced methods like DEXA scans when measurements are taken properly.

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, women's formula includes hip circumference. This calculator is for men only.

Q4: How often should I measure?
A: Every 4-8 weeks to track progress, as daily fluctuations are normal.

Q5: What affects measurement accuracy?
A: Hydration status, time of day, measurement technique, and recent exercise can all affect results.