1. What is the US Navy Body Fat Formula?

The US Navy body fat formula is a method developed by the US Navy to estimate body fat percentage using circumference measurements. It's a practical alternative to more complex methods like hydrostatic weighing or DEXA scans.

2. How Does the Calculator Work?

The calculator uses the US Navy body fat formula for men:

Where:

• \( abdomen \) — Abdomen circumference at navel (inches)
• \( neck \) — Neck circumference (inches)
• \( height \) — Height in inches

Explanation: The formula uses logarithmic relationships between body measurements to estimate body fat percentage.

3. Importance of Body Fat Percentage

Details: Body fat percentage is a key health indicator, more accurate than BMI for assessing fitness. The US Navy uses this for fitness standards and health assessments.

4. Using the Calculator

Tips:

• Measure abdomen at navel level after normal exhalation
• Measure neck just below the larynx
• All measurements should be in inches
• Values must be positive and abdomen > neck

5. Frequently Asked Questions (FAQ)

Q1: Is this formula accurate for women?
A: No, this calculator uses the male formula. Women have a different equation that includes hip measurements.

Q2: How does this compare to other body fat methods?
A: It's reasonably accurate for most people but may vary ±3-4% compared to DEXA scans.

Q3: What are healthy body fat percentages?
A: For men: 6-24% is typical (athletes 6-13%, fitness 14-17%, average 18-24%, obese 25%+).

Q4: When should measurements be taken?
A: Morning before eating, after using the bathroom, and before exercise for most consistent results.

Q5: Why doesn't weight appear in the formula?
A: The formula uses circumference ratios which indirectly account for weight distribution.