Body Fat (Navy Method)

Quick answer

This calculator computes body composition with validated field methods — the US Navy tape formula accurate to 3–4%, the Deurenberg BMI conversion,

Figures are estimates from this calculator’s standard formula — adjust the inputs in the tool below for your exact number.

How Does the Body Fat (Navy Method) Work?

The Body Fat (Navy Method) allows you to perform calculations quickly and easily. Simply enter the required values and click the calculate button to get instant results.

1
Enter Values
Provide your values in the fields shown.
2
Adjust Settings
Enter your body data and exercise goals.
3
View Results
Click the "Calculate" button to see the result instantly.

Use Cases

Health screening

WHI above 0.90 (men) or 0.85 (women) flags central fat risk

Cutting checkpoints

A 4 cm waist drop usually means 1.5–2% less body fat

Athlete monitoring

Track composition when the scale hides muscle gain

Common Mistakes

Trusting a single measurement instead of a monthly trend
Sucking the waist in during measurement
Comparing readings taken at different times of day

FAQs

How accurate is the Body Fat (Navy Method)?

The circumference method tracks hydrostatic weighing within about 3–4% when you measure the same sites consistently.

What formula does the Body Fat (Navy Method) use?

The US Navy equation from waist, neck and hip circumferences, cross-checked against the Deurenberg BMI estimate.

When should I retake the Body Fat (Navy Method)?

Every 4 weeks under identical conditions — morning, fasted, same tape tension.

Why did my Body Fat (Navy Method) result change overnight?

Food and water shift waist circumference 2–3 cm, moving estimates 1–2% — compare same-condition readings only.

Related tools

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Advanced Body Fat Navy Calculator

Calculate body fat using advanced Navy method.

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