Body Fat Calculator

U.S. Navy body fat formula from circumference measurements.

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See how it works

Watch a quick simulation of this tool in action — no file needed.

How to use Body Fat Calculator

Follow these steps — everything happens instantly in your browser.

  1. 1

    Step 1. Pick your biological sex.

  2. 2

    Step 2. Enter your height, neck circumference and waist circumference.

  3. 3

    Step 3. If you're female, also enter your hip circumference.

  4. 4

    Step 4. Read your estimated body fat percentage and category.

Why use this tool

Frequently asked questions

Everything you might want to know about body fat calculator.

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