How to Calculate Body Fat Percentage Using the US Navy Method

The US Navy body fat method estimates body fat percentage from simple circumference measurements taken with a tape measure. While not as accurate as hydrostatic weighing or DEXA scans, it is practical and reasonably accurate for most people. The method uses neck, waist, and hip (women only) circumferences along with height to estimate fat percentage.

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Formula

$$BF_{male} = 495 \div \left(1.0324 - 0.19077\log(waist-neck) + 0.15456\log(height)\right) - 450$$

Body Fat Percentage Calculator

Estimate body fat percentage using the US Navy method.

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Worked Example

Given:

Sex = MaleHeight = 180 cmWaist = 85 cmNeck = 38 cm

ResultBody Fat: 16.2% — Category: Fitness

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FAQs

Where do I measure waist circumference?

For men, measure waist circumference at the navel (belly button) level. For women, measure at the narrowest point of the waist, typically about halfway between the ribs and hip bone. Keep the tape horizontal and snug but not compressing the skin. Measure on an exhale.

What are healthy body fat percentage ranges?

For men: essential fat 2–5%, athletes 6–13%, fitness 14–17%, average 18–24%, obese 25%+. For women: essential fat 10–13%, athletes 14–20%, fitness 21–24%, average 25–31%, obese 32%+. Women naturally carry more essential fat due to hormonal and reproductive needs.

How accurate is the Navy method compared to other methods?

The Navy method has an error margin of about ±3–4% body fat compared to DEXA (the gold standard). It is more accurate than BMI for estimating body composition but less accurate than hydrostatic weighing. Consistency in measurement technique is crucial for reliable results.