BodyStd

Body Fat Calculator

Estimate your body fat percentage using the US Navy circumference method. Enter your height, weight, neck, waist, and hip measurements for instant results.

BodyStd · https://bodystd.com/ · 8/10/2026

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Body Fat Calculator

Estimate your body fat percentage using the US Navy circumference method. Enter your height, weight, neck, waist, and hip measurements for instant results.

Authority Source

This calculator uses the US Navy circumference method, a standard body composition estimation technique referenced by the CDC and the American Council on Exercise (ACE) for body fat assessment.CDC body composition assessment.

Frequently Asked Questions

The US Navy circumference method is a widely used estimation technique that is reasonably accurate for most adults (typically within 3-4% of clinical methods like DEXA). It is most accurate when measurements are taken consistently at the same anatomical landmarks. For clinical diagnosis, methods like DEXA, hydrostatic weighing, or Bod Pod are more precise.

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Disclaimer: This calculator is for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider with questions about a medical condition.

How to measure body-fat percentage

No at-home method is perfect, so pick one method and track the trend rather than any single reading. DEXA is the clinical reference standard; BIA scales and the U.S. Navy method are practical at home.

Steps

  1. BIA scales: use the same scale, same time of day, and similar hydration (e.g., before breakfast) — readings swing with fluid, meals, and recent exercise.
  2. Navy method: measure waist, neck (and hips for women) at consistent sites; small measurement errors shift the result.
  3. Skinfold calipers: use the same sites and consistent pressure; technique matters more than the brand.

Common errors to avoid

  • Comparing one method’s number directly to another method’s range — each has its own margin of error (often several percentage points).
  • Trusting a single reading instead of the week-to-week trend.

These are measurement tips, not medical advice. For interpretation, consult a qualified healthcare professional. Body-fat measurement methods compared.