1. What is Body Fat Percentage?

Body fat percentage is the proportion of fat to total body weight. This calculator provides an estimate specifically designed for men with muscle mass, using the U.S. Navy body fat formula based on circumference measurements.

2. How Does the Calculator Work?

The calculator uses the U.S. 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 formula accounts for the relationship between body circumferences and fat distribution, adjusted for height.

3. Importance of Body Fat Measurement

Details: Body fat percentage is a better indicator of fitness than body weight alone, especially for muscular individuals where BMI may be misleading.

4. Using the Calculator

Tips: Measure waist at navel level while standing relaxed. Neck should be measured just below the larynx. All measurements in centimeters.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this method?
A: It's reasonably accurate (±3-4%) for most men, though DEXA scans or hydrostatic weighing are more precise.

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

Q3: Why does this calculator only work for men?
A: Women have different fat distribution patterns and require a different formula that includes hip measurements.

Q4: How often should I measure body fat?
A: Every 4-8 weeks to track progress, measured under consistent conditions (time of day, hydration level).

Q5: Does muscle mass affect the accuracy?
A: This formula is designed to be more accurate for muscular individuals than standard BMI calculations.