US Body Fat Calculator

Body Fat Formula (US Navy Method):

For Men: 86.010 × log10(abdomen - neck) - 70.041 × log10(height) + 36.76
For Women: 163.205 × log10(waist + hip - neck) - 97.684 × log10(height) - 78.387

Gender:

Height:

inches

Neck Circumference:

inches

Waist Circumference:

inches

Hip Circumference:

inches

Body Fat Percentage:

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1. What is the US Body Fat Calculator?

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

Purpose: It helps individuals assess their body composition without specialized equipment.

2. How Does the Calculator Work?

The calculator uses different formulas for men and women:

For Men: 86.010 × log10(abdomen - neck) - 70.041 × log10(height) + 36.76
For Women: 163.205 × log10(waist + hip - neck) - 97.684 × log10(height) - 78.387

Explanation: The formulas use logarithmic relationships between body measurements to estimate fat percentage.

3. Importance of Body Fat Percentage

Details: Body fat percentage is a better health indicator than BMI alone, helping assess fitness levels and health risks.

4. Using the Calculator

Tips:

Measure circumference at the narrowest point for neck, natural waist for waist
For women, measure hips at the widest point
Measure in inches
All measurements must be > 0

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this method?
A: The Navy method is about ±3% accurate compared to professional methods like DEXA scans.

Q2: Why different formulas for men and women?
A: Women naturally carry more body fat, especially in hip areas, requiring different calculations.

Q3: What's a healthy body fat percentage?
A: For men: 6-24%, Women: 16-30%. Athletes typically have lower percentages.

Q4: When should I measure?
A: Measure in the morning before eating, with relaxed muscles and normal breathing.

Q5: Can I use this if I'm very muscular?
A: This method may overestimate fat for extremely muscular individuals.