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Health, Fitness & Wellness

Body Fat Percentage Calculator (Navy Tape Method)

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Plain-English guide

Terms & how it works

Confused by a field? Read the short definitions here while you use the tool.

  • Sex (0=F, 1=M)

    The “Sex (0=F, 1=M)” value used in this tool’s formula. Adjust it to see results update live.

  • Height (in)

    The “Height (in)” value used in this tool’s formula. Adjust it to see results update live.

  • Neck (in)

    The “Neck (in)” value used in this tool’s formula. Adjust it to see results update live.

  • Waist (in)

    The “Waist (in)” value used in this tool’s formula. Adjust it to see results update live.

  • Hip (in, women)

    The “Hip (in, women)” value used in this tool’s formula. Adjust it to see results update live.

U.S. Navy circumference formula from neck, waist, hips, and height.

Estimate body fat % with neck, waist, hip, and height tape measurements. Estimates only—not a diagnosis or prescription.

How this calculator works

Estimate body fat % with neck, waist, hip, and height tape measurements. Estimates only—not a diagnosis or prescription. U.S. Navy circumference formula from neck, waist, hips, and height. Scenario: 5'10" male, 15 in neck, 34 in waist → ~18% body fat (estimate).

U.S. Navy circumference formula from neck, waist, hips, and height.

Scenario: 5'10" male, 15 in neck, 34 in waist → ~18% body fat (estimate).

When to use this Body Fat Percentage

Common use cases

  • Estimate body fat % with neck, waist, hip, and height tape measurements.
  • Sanity-check with this scenario: 5'10" male, 15 in neck, 34 in waist → ~18% body fat (estimate).
  • The relationship is: U.S. Navy circumference formula from neck, waist, hips, and height.

Localized examples

  • Health, Fitness & Wellness: the example on this page uses the same formula as the widget.

What you get

  • Fields: Sex (0=F, 1=M), Height (in), Neck (in), Waist (in)
  • U.S. Navy circumference formula from neck, waist, hips, and height.
  • Scenario on the page: 5'10" male, 15 in neck, 34 in waist → ~18% body fat (estimate).

How to Calculate Body Fat Percentage

  1. 1Enter Sex (0=F, 1=M), Height (in), Neck (in), then the remaining fields. Use the values you have, not a catalog average, unless that is all you know.
  2. 2U.S. Navy circumference formula from neck, waist, hips, and height.
  3. 3Scenario: 5'10" male, 15 in neck, 34 in waist → ~18% body fat (estimate).
  4. 4If this number would change a drug, a diet, or a return-to-play call, take it to a clinician. The page never examined you.

Governing formula

U.S. Navy circumference formula from neck, waist, hips, and height.

5'10" male, 15 in neck, 34 in waist → ~18% body fat (estimate).

5'10" male, 15 in neck, 34 in waist → ~18% body fat (estimate).

Variable definitions

  • sex

    Sex (0=F, 1=M)

    The “Sex (0=F, 1=M)” field. Default 1; typical range 0–1.

  • heightIn

    Height (in)

    The “Height (in)” field. Default 70; typical range 48–84.

  • neckIn

    Neck (in)

    The “Neck (in)” field. Default 15; typical range 10–25.

  • waistIn

    Waist (in)

    The “Waist (in)” field. Default 34; typical range 20–60.

  • hipIn

    Hip (in, women)

    The “Hip (in, women)” field. Default 0; typical range 0–60.

  • The formula (U.S. Navy circumference formula from neck, waist, hips, and height.) does not see labs, medications, sleep, or injury history. A clinician does.
  • Nothing here is uploaded for the calculation itself.

Frequently Asked Questions

U.S. Navy circumference formula from neck, waist, hips, and height.

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4.8

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4 reviews

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Aisha K.

Mar 12, 2026

Clean layout and the results update instantly. Exactly what I needed for a quick planning check.

Daniel R.

Feb 28, 2026

Very usable on mobile. Would love a save/export option later, but the math feels solid.

Priya S.

Feb 3, 2026

The FAQ section answered my questions before I even had to search. Smooth dark mode too.

Marcus L.

Jan 19, 2026

Simple inputs, clear outputs. This replaced three bookmarks I used to juggle.

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