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Health Calculators

Navy Body Fat Calculator

Verified formula Updated Jun 2026 Private — runs on your device

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Verified formula Private

Body fat (US Navy, male)

16.4%

For general information only — not financial, tax, legal or medical advice. Verify before you rely on it.

How to use the Navy Body Fat Calculator

The Navy Body Fat Calculator works out your body fat (us navy, male) in an instant. Enter waist circumference, neck circumference and height and the result updates as you type — it is free, needs no sign-up, and runs entirely in your browser so your figures stay private.

  1. Enter the waist circumference.
  2. Enter the neck circumference.
  3. Enter the height.
  4. Read off your body fat (us navy, male) — the calculator updates automatically, with no button to press.

Worked example

For example, with waist circumference of 85 cm, neck circumference of 38 cm and height of 178 cm, the body fat (us navy, male) is 16.4%.

Inputs used
Waist circumference 85 cm
Neck circumference 38 cm
Height 178 cm
Results
Body fat (US Navy, male) 16.4%

Results are estimates for educational use, not professional advice.

Key terms explained

Circumference
The distance around the edge of a circle, equal to 2 × π × radius.
Body fat
The proportion of your body weight that is fat, as opposed to muscle, bone and water.

Frequently asked questions

It estimates body fat from waist, neck and height measurements using a logarithmic formula. For waist 85, neck 38 and height 178 cm it gives about 16.5%.

It is reasonably accurate for most people and needs only a tape measure, though methods like DEXA are more precise.

Measure the waist at the navel, the neck just below the larynx, and height standing straight, keeping the tape snug and level.

This uses the male formula, which needs waist, neck and height. The female version also includes the hip measurement.

Enter the waist circumference. Enter the neck circumference. Enter the height. Read off your body fat (us navy, male) — the calculator updates automatically, with no button to press.

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For men, a healthy body fat percentage is roughly 10–20%, and for women about 18–28%, with women naturally carrying more essential fat. Athletes are often lower, while levels well above these ranges raise health risks.

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Why the number on the scale tells only part of the story — body fat, lean mass, the FFMI, where fat is stored, and how to measure and track your true body composition.

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