🏃 Sports Calculator

Body Fat Percentage Calculator

Track body composition changes accurately.

How to Use This Tool

  1. Enter your gender.
  2. Measure waist, neck, and height.
  3. Women: also measure hip circumference.
  4. Click Calculate to see your body fat percentage.

The Formula

U.S. Navy formula uses log-based ratios of circumference measurements.

Why It Matters

You are a 28-year-old male athlete: 180 lbs, 34-inch waist, 15-inch neck, 70-inch height. The U.S. Navy method estimates 12.5% body fat — in the athletic range. For competitive sports, males typically need 6-13%.
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