My Body Fat Percentage Calculator

Navy Body Fat Formula (Male):

\[ \text{Body Fat %} = 86.010 \times \log_{10}(\text{abdomen} - \text{neck}) - 70.041 \times \log_{10}(\text{height}) + 36.76 \]

Body Fat Percentage:

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1. What is the Navy Body Fat Formula?

The Navy Body Fat Formula is a method developed by the U.S. Navy to estimate body fat percentage using circumference measurements. It provides a practical and accessible way to assess body composition without specialized equipment.

2. How Does the Calculator Work?

The calculator uses the Navy Body Fat Formula:

\[ \text{Body Fat %} = 86.010 \times \log_{10}(\text{abdomen} - \text{neck}) - 70.041 \times \log_{10}(\text{height}) + 36.76 \]

Where:

\( \text{abdomen} \) — Abdomen circumference at navel level (inches)
\( \text{neck} \) — Neck circumference below larynx (inches)
\( \text{height} \) — Height in inches

Explanation: The formula uses logarithmic transformations of circumference measurements to estimate body fat percentage, accounting for body proportions.

3. Importance of Body Fat Percentage

Details: Body fat percentage is a key indicator of overall health and fitness. It helps assess obesity risks, monitor fitness progress, and guide nutrition and exercise plans more accurately than body weight alone.

4. Using the Calculator

Tips: Measure abdomen at navel level and neck below the larynx. Ensure measurements are in inches. All values must be valid (abdomen > neck > 0, height > 0).

5. Frequently Asked Questions (FAQ)

Q1: Is this formula accurate for everyone?
A: The Navy formula is most accurate for adults aged 18-60. It may be less accurate for very lean or very obese individuals, athletes, and elderly populations.

Q2: What are healthy body fat percentage ranges?
A: For men: 6-24% (essential fat: 2-5%, athletes: 6-13%, fitness: 14-17%, average: 18-24%, obese: 25%+)

Q3: How should measurements be taken?
A: Use a flexible tape measure. Abdomen: at navel level, relaxed exhale. Neck: below Adam's apple. Height: without shoes.

Q4: Are there female versions of this formula?
A: Yes, the Navy has a separate formula for women that includes hip measurements: 163.205 × log10(waist + hip - neck) - 97.684 × log10(height) - 78.387

Q5: How often should I measure body fat?
A: Monthly measurements are sufficient to track changes. Daily fluctuations are normal due to hydration and other factors.