1. What is Body Fat Percentage?

Body fat percentage is the total mass of fat divided by total body mass, multiplied by 100. It is a more accurate indicator of fitness than body weight alone, as it distinguishes between fat 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 (inches)
• \( neck \) — Neck circumference (inches)
• \( height \) — Height (inches)

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

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. High body fat is associated with increased risk of chronic diseases.

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 inches
• Waist must be larger than neck measurement

5. Frequently Asked Questions (FAQ)

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

Q2: What's a healthy body fat percentage?
A: For men: 6-24% is typical (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 measurement. This calculator is for men only.

Q4: When should measurements be taken?
A: Best in the morning before eating, with consistent measurement conditions for tracking changes.

Q5: How often should I check my body fat?
A: Every 2-4 weeks is sufficient to track meaningful changes, as daily fluctuations are normal.