Body Fat Calculator

Estimate body fat % with the U.S. Navy method

Body fat
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category

Body Fat Calculator — guide & how to use

What it does

This body fat calculator uses the U.S. Navy tape method to estimate your body fat percentage from a few measurements — no calipers needed — and shows your category. Calculated privately in your browser, free.

How to use it

  1. Pick your sex and enter your height.
  2. Measure your neck and waist (and hip for women) in inches.
  3. Read your estimated body fat % and category.

How to embed this tool on your website

No account, no coding. Copy the embed code and paste it where you want it to appear:

<iframe src="https://snaptoolsuite.com/body-fat-calculator/?embed=1"
  style="width:100%;max-width:560px;height:820px;border:0;"
  title="Body Fat Calculator" loading="lazy"></iframe>
<p>Free <a href="https://snaptoolsuite.com/body-fat-calculator/">Body Fat Calculator</a> by Snap Tool Suite</p>
2 Paste it on your page
3 It just works

See it live: view a real embed example →

Frequently asked questions

How does the Navy method work?

A log-based formula from height, neck, and waist (plus hip for women). Quick, no equipment.

What's a healthy body fat %?

Roughly men 10–20%, women 18–28%. A guide, not a diagnosis.

Is it really free?

Yes. 100% free, everything runs in your browser.

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🔒 Everything is calculated in your browser. We don't store or sell your data. Estimate only — not medical advice.