Body Fat Percentage Calculator

Body Fat Formula (Navy Method):

\[ \text{Body Fat %} = 495 / (1.0324 - 0.19077 \times \log_{10}(\text{waist} - \text{neck}) + 0.15456 \times \log_{10}(\text{height})) - 450 \]

Gender:

Height:

inches

Neck Circumference:

inches

Waist Circumference:

inches

Hip Circumference (Women only):

inches

Body Fat Percentage:

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1. What is a Body Fat Percentage Calculator?

Definition: This calculator estimates body fat percentage based on body circumference measurements using the U.S. Navy method.

Purpose: It helps individuals assess their body composition for fitness, health monitoring, and weight management.

2. How Does the Calculator Work?

The calculator uses the U.S. Navy body fat formula:

\[ \text{Body Fat %} = 495 / (1.0324 - 0.19077 \times \log_{10}(\text{waist} - \text{neck}) + 0.15456 \times \log_{10}(\text{height})) - 450 \]

For women, the formula includes hip circumference:

\[ \text{Body Fat %} = 495 / (1.29579 - 0.35004 \times \log_{10}(\text{waist} + \text{hip} - \text{neck}) + 0.22100 \times \log_{10}(\text{height})) - 450 \]

3. Importance of Body Fat Percentage

Details: Body fat percentage is a better indicator of health than weight alone, helping assess fitness level and health risks.

4. Using the Calculator

Tips:

Measure circumference at the narrowest point for neck, natural waist (navel level), and hips (widest point for women)
Measure in inches with a flexible tape measure
Take measurements in the morning before eating

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this method?
A: The Navy method is about 3-4% accurate compared to more advanced methods like DEXA scans.

Q2: What's a healthy body fat percentage?
A: For men: 6-24%, Women: 16-30%. Athletes typically have lower percentages.

Q3: Why different formulas for men and women?
A: Women naturally carry more body fat, especially in hip/thigh areas.

Q4: Can I use centimeters instead of inches?
A: No, the formula is calibrated for inches. Convert cm to inches first (1 inch = 2.54 cm).

Q5: How often should I measure?
A: Every 4-8 weeks to track progress. Daily fluctuations are normal.