Body Fat Calculator - US Navy Method

  • Male
  • Female
Results
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Estimate your body fat percentage using the US Navy tape method — the same formula used for military fitness standards worldwide. Unlike BMI, body fat percentage distinguishes between fat mass and lean mass, giving a much clearer picture of body composition.

For men, enter neck and waist circumference plus height. For women, hip circumference is also required, since the formula uses waist + hip − neck. The result shows your estimated body fat percentage along with fat mass and lean body mass in kilograms.

Body fat percentage is a better health indicator than weight alone: two people with identical BMI can have very different compositions. Track your measurements over time rather than obsessing over a single reading — the trend tells you whether your training and nutrition are working. For best accuracy, measure at the same time of day, keep the tape level and snug, and average multiple readings.

公式
Men: %BF = 495 / (1.0324 − 0.19077·log₁₀(waist−neck) + 0.15456·log₁₀(height)) − 450. Women: %BF = 495 / (1.29579 − 0.35004·log₁₀(waist+hip−neck) + 0.22100·log₁₀(height)) − 450

よくある質問

How does the US Navy body fat method work?
It estimates body fat from circumference measurements: neck, waist (and hips for women), plus height. The formula was developed by the US Navy and is the official standard for military fitness assessment.
How do I measure correctly?
Use a flexible tape measure. Neck: below the larynx, tape sloping slightly down at the front. Waist: at the navel for men, at the narrowest point for women. Hips: at the widest point. Keep the tape snug but not compressing the skin.
What is a healthy body fat percentage?
For men, 10-20% is generally considered fit and 6-13% athletic. For women, 18-28% is fit and 14-20% athletic. Essential fat is about 3% for men and 12% for women.
How accurate is the tape method?
Compared to DEXA scans, the Navy method is typically within 3-4 percentage points. Accuracy improves with careful, consistent measurement technique — take each measurement 2-3 times and average.

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