How accurate is the Navy method?

It is a reasonable estimate, usually within a few percentage points of more expensive methods for most people. It is most useful for tracking your own change over time rather than as an exact figure.

Neck just below the larynx, waist at the navel for men and at the narrowest point for women, and hips at the widest point. Keep the tape level and snug.

Verified formulaLast reviewed July 2026

Body Fat Calculator

Estimate your body fat percentage from simple tape measurements using the U.S. Navy method.

Your details

Sex

Height (ft)

Height (in)

Neck (in)

Waist (in)

Hip (women) (in)

Calculated live in your browser. Nothing is stored or sent anywhere.

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A mathematical estimate based on validated equations, for education only. It is not a diagnostic tool.

The science

Body fat percentage tells you more about body composition than weight alone. This calculator uses the U.S. Navy circumference method, which needs only a tape measure, to give a reasonable estimate without calipers or a scan. It is an approximation, but a genuinely useful one for tracking change over time.

The formula

U.S. Navy circumference method (measurements in inches)

Sources

1
Hodgdon JA, Beckett MB. U.S. Navy body fat equations (Naval Health Research Center).
2
American Council on Exercise body composition norms

Common questions

This tool is for education only and is not a diagnostic device. Consult a licensed clinician before making health decisions.