How accurate is the Navy method?

Typically within a few percent of lab methods like DEXA when you measure carefully and consistently. Trends over time matter more than any single reading.

Body Fat Calculator

Estimate body-fat percentage with the U.S. Navy tape method, then derive fat mass and lean body mass from body weight.

Body WeightlbHeightinNeckinWaist (at navel)in

Estimated Body Fat

11.1%

U.S. Navy circumference method

CategoryAthletic

Lean Body Mass151.2 lb

Estimated Fat Mass18.8 lb

DISCLAIMER: The Navy tape-measure method is an estimate and can differ several percent from DEXA or calipers. Lean body mass is body weight minus the estimated fat mass, so it carries the same measurement error. Measure relaxed with a flexible tape and use the same spots each time. Not medical advice.

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What Is the Body Fat Calculator?

The Body Fat Calculator estimates your body fat percentage from tape measurements (height, neck, waist — plus hip for women) using the U.S. Navy circumference method, and classifies the result from essential fat to obese. Calculated privately in your browser.

How It Works

Choose your sex and units, measure with a flexible tape and enter the numbers. Your estimated body fat percent and category appear instantly.

When to Use It

Use it to track body composition over time — it's more informative than weight alone and needs only a tape measure.

Frequently Asked Questions

How accurate is the Navy method?: Typically within a few percent of lab methods like DEXA when you measure carefully and consistently. Trends over time matter more than any single reading.

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