Body Fat Calculator - US Navy Method (Circumference)

Estimate body fat percentage from neck, waist, and hip circumference using the US Navy formula

🔒 100% in-browser🆓 Free forever⚡ No sign-up
Estimated body fat
16.9%
Fitness
Uses the US Navy circumference method. Results are estimates only and less accurate than DEXA or hydrostatic weighing. Do not use as a medical diagnosis.
Estimates only. Results are generated by generalised formulas from the inputs you provide and are for informational purposes only. They are not financial, tax, legal, medical, or professional advice, and do not account for your individual circumstances, jurisdiction, taxes, fees, or health conditions. Verify important figures with a qualified professional. By using this tool you agree to our Terms & Disclaimer.

How it works

  1. 1
    Pick units and sex

    Metric (cm) or imperial (in), and male or female - the formula differs slightly.

  2. 2
    Enter measurements

    Height, neck, and waist circumference. Females also enter hip circumference.

  3. 3
    Read the estimate

    See estimated body fat percentage and a general fitness classification.

About Body Fat Calculator - US Navy Method (Circumference)

Free body fat percentage calculator using the US Navy circumference method. Enter your height and neck, waist (and hip, for females) circumferences to estimate body fat percentage and classification. Works in metric (cm) or imperial (inches). Runs entirely in your browser. Body Fat Calculator - US Navy Method (Circumference) on 712 Tools runs entirely inside your browser using modern JavaScript APIs - no server ever sees your data. That means instant results, complete privacy, and no upload limits.

Whether you need to estimate body fat percentage from neck, waist, and hip circumference using the us navy formula for a debugging session, a quick sanity check, or a production incident, this tool is free to use as many times as you need. There are no watermarks, no sign-up, and no ads inside the tool itself.

Frequently asked questions

How accurate is this?

The US Navy method is accurate to within about ±3% body fat for most people. It is less accurate than DEXA or hydrostatic weighing but requires only a tape measure.

Is body fat percentage a medical diagnosis?

No. This is a screening tool. Consult a healthcare provider for a medical assessment.

Is my data uploaded?

No. All calculations run entirely in your browser.

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