Body Fat Calculator

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Navy Method Analysis

Calculate body fat percentage using the U.S. Navy method

Measurements

Measure just below the Adam's apple

Measure at the navel

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Enter Your Measurements

Fill in your measurements to calculate body fat percentage

Frequently Asked Questions

Get answers to common questions about body fat calculator

ℹ️ What is Body Fat Calculator?

A body fat calculator estimates your body fat percentage using measurements like height, weight, neck, waist, and hip circumference (using the US Navy method or BMI-based method). Body fat percentage is a more precise fitness and health indicator than BMI alone.

📐 Formula

Navy Method (Male): %BF = 86.010×log₁₀(waist−neck) − 70.041×log₁₀(height) + 36.76
Waist— Circumference at navel level (cm or inches)
Neck— Circumference just below the larynx
Hip— Widest point (females only)
Height— Standing height in same units

✏️ Worked Example

Height: 178 cm
Neck: 38 cm
Waist: 85 cm
Sex: Male
  1. 1Waist − Neck = 85 − 38 = 47
  2. 2log₁₀(47) = 1.6721 | log₁₀(178) = 2.2504
  3. 3%BF = 86.010 × 1.6721 − 70.041 × 2.2504 + 36.76
  4. 4%BF = 143.82 − 157.57 + 36.76 ≈ 23.0%
✅ Result: Estimated Body Fat ≈ 23% → Acceptable (fitness threshold)

💡 How to Interpret Results

  • ▸Essential fat: 2–5% men, 10–13% women (minimum for physiological function).
  • ▸Athletic: 6–13% men, 14–20% women.
  • ▸Fitness: 14–17% men, 21–24% women.
  • ▸Acceptable: 18–24% men, 25–31% women.
  • ▸Above 25% men / 32% women — considered obese by body composition standards.

❓ Frequently Asked Questions

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