Formula
The U.S. Navy circumference method estimates body density from waist, neck and height, plus hips for the female formula, then converts it to body-fat percentage.
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Body Fat Estimator
Enter your values for a transparent, reproducible body fat estimator, with the formula and scope shown.
LiveScenario estimateLocal calculationUS · USD
Your inputs
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Live result
Estimated body-fat percentage
16.21%
Circumference methods have individual error and are best used to track trends.
- Waist circumference
- 32.3 in
- Neck circumference
- 14.6 in
- Estimation note
- Approximately ±3～5 percentage points
Reproducible, not guessed
How was this calculated?
Scope
Use values that match your situation and location. Verify rule-based, contractual, financial or health decisions against an authoritative local source.
Model context
localeen-UScountryUScurrencyUSDtimezoneAmerica/New_Yorkunit_systemimperialrules_versionus-2026.08source_languageen-US
Results are for first-pass estimates and scenario comparison. Important tax, employment, health and investment decisions should be verified against local official guidance or a qualified professional.