Health & Fitness
Body Fat US Navy Method Calculator
Estimate body fat percentage from neck, waist and hip girths using the US Navy tape method.
Preparing your result…
What this calculator does
Calculates Body Fat US Navy Method Calculator using the formula verified against the cited source.
What your result means
An estimate from the inputs you enter, within the scope stated below — not advice.
Formula
Men: %BF = 495 ÷ (1.0324 − 0.19077·log₁₀(waist − neck) + 0.15456·log₁₀(height)) − 450
The step-by-step working for your own numbers appears with the result above and in the PDF report.
Frequently asked questions
Symbols and assumptions
- Inputs
- The values entered in the fields above
- • Historical Navy circumference-density method, all lengths cm: male D=1.0324−0.19077log10(waist−neck)+0.15456log10(height); female D=1.29579−0.35004log10(waist+hip−neck)+0.22100log10(height). BF%=495/D−450.
Sources and review
Reviewed 2026-10-18 · Next review 2027-04-18
- • Identify the historical density version and anatomical measurement protocol. Do not interchange the inch-based direct-percentage equation or describe it as current service policy. Positive height and log arguments required. This is a population estimate, not measured body fat. Research reproduction Table 1 supplies coefficients; original DTIC reports may restrict automated access.
Important limitation
This is an educational estimate based only on the values and formula shown. Verify current rates, rules, units, and professional standards before relying on the result. It is not personalized financial or investment advice.
Quick reference
| Scenario | Height (cm) | Neck girth (cm) | Waist girth (cm) | Estimated body fat |
|---|---|---|---|---|
| Worked example | 175 | 38 | 85 | 16.938% |
| Half the amounts | 130 | 25 | 50 | 3.1116% |
| Double the amounts | 220 | 60 | 170 | 42.5332% |
Need the full picture? Get the detailed PDF report with charts, tables, formulas and working steps.
Reviewed 2026-10-18 · Next review 2027-04-18
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