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Calctive

Body Fat Calculator

Calculate your body fat percentage using the US Navy Method. Track your lean mass, fat mass, and see which fitness category you fall into.

Input Values

💡Measurement Tips

  • •Measure neck at the narrowest point, below the larynx
  • •Measure waist at the narrowest point or at navel level, whichever is larger
  • •For women, measure hips at the widest point around the buttocks
  • •Take measurements in the morning before eating for consistency

Results

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Enter values and calculate

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How to Use

  1. 1Select your gender (Male/Female)
  2. 2Choose your preferred unit system (Metric/Imperial)
  3. 3Enter your age, weight, and height
  4. 4Measure and input your neck circumference
  5. 5Measure and input your waist circumference
  6. 6For females, also measure and input hip circumference
  7. 7Click Calculate to see your body fat percentage and category
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Formula

US Navy Method: Male: 495 / (1.0324 - 0.19077 × log10(waist - neck) + 0.15456 × log10(height)) - 450 Female: 495 / (1.29579 - 0.35004 × log10(waist + hip - neck) + 0.22100 × log10(height)) - 450  Where measurements are in centimeters
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Common Use Cases

Track body composition changes during weight loss journey
Monitor fitness progress for athletic training
Assess health risks associated with body fat levels
Compare your body fat percentage to fitness standards