Body Fat Calculator

Estimate body fat percentage using the US Navy circumference method.

0Body fat %
—Category

US Navy circumference method — an estimate only. Accuracy varies; methods like DEXA are more precise.

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How to use Body Fat Calculator

Three quick steps — no sign-up needed

  1. Step 1

    Select sex

    Choose Male or Female - the Navy method uses slightly different tape sites by sex.

  2. Step 2

    Measure height, neck, waist (and hips if female)

    Use a flexible tape at the standard points: neck, waist, and for females also hips. Keep the tape level and snug, not tight.

  3. Step 3

    Get the body fat estimate

    See an estimated body fat percentage from the circumference formula - useful when you do not have DEXA or calipers.

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About Body Fat Calculator

Body Fat Calculator estimates body fat percentage from simple tape measurements using the widely referenced US Navy method. Searches for "Navy body fat calculator", "body fat percentage from measurements", and "tape measure body fat" describe exactly this approach.

Enter sex, height, neck, and waist; female estimates also use hip circumference. Measure consistently (same time of day, same tape landmarks) so progress checks are comparable week to week. Results are estimates - not DEXA, Bod Pod, or hydrostatic weighing.

Circumference methods can misread unusual builds, post-pregnancy changes, or measurement error. Track trends over time rather than obsessing over a single decimal. Pair with strength, how clothes fit, and clinical advice when body composition matters for health.

These results are educational estimates only and are not a medical diagnosis. Talk to a qualified clinician for personal health decisions. This tool does not diagnose obesity-related disease or prescribe weight-loss treatment.

Benefits of Body Fat Calculator

Tape-only method No special machine - height and circumferences are enough for an estimate.
Sex-specific inputs Male and female forms follow the measurement sites the Navy-style equations expect.
Progress tracking aid Repeat monthly with the same technique to spot direction of change.
Accessible online Handy when you only have a measuring tape at home.

Frequently asked questions

How does the US Navy body fat method work?

It uses height and circumference measurements (neck, waist, and hips for women) in a published estimation formula.

Where should I measure waist and neck?

Use standard landmarks: waist near the navel level as guided by the method you follow; neck below the larynx. Be consistent each time.

Why is my result different from a smart scale?

Bioimpedance scales and tape formulas use different physics. Expect variation between methods.

Do I need hip measurement?

Female estimates in this tool include hip circumference. Male estimates focus on height, neck, and waist.

Is this a medical diagnosis?

No. Body fat percentage here is an educational estimate only.