Toolzer

Body Fat Calculator

US Navy method — estimate body fat % from a few tape measurements.

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Estimated body fat
16.9%
Fitness

Based on the U.S. Navy circumference method. Results are an estimate; consult a professional for medical decisions.

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About this Body Fat Calculator

Estimate your body-fat percentage using the U.S. Navy circumference method — the same formula used by fitness professionals and military evaluators. Enter your height and neck/waist (and hips for women) in metric or imperial, and the calculator returns your body-fat percentage along with the ACSM fitness category. Nothing is stored.

How to use Body Fat Calculator

Open the page, enter the input you want to check, and the result appears immediately above — there is nothing to install, no account to create, and no popup to dismiss. Every Toolzer utility is designed to give you the answer on the first screen and let you copy or share it in one click. If the result looks unexpected, run the test a second time: transient network conditions, browser extensions, and corporate proxies can all affect single-shot measurements, and a fresh run usually confirms whether the issue is real or a one-off blip.

Every tool on Toolzer is built to work on desktop and mobile, including the latest versions of Chrome, Edge, Firefox, Safari, and Brave. Results are rendered directly in your browser whenever possible, so the page stays responsive even on slow connections. When a server lookup is required — for example to query public DNS, WHOIS, or geolocation databases — the request is proxied through Toolzer's edge so the third-party service never sees your IP address.

Privacy & how this tool works

Toolzer is a privacy-first toolbox: the page is served as a static, minified bundle with long-lived cache headers, so repeat visits are essentially free for both you and our servers. Inputs you type — text to format, passwords to generate, URLs to inspect — stay on your device unless an explicit server lookup is required. We do not sell data, we do not run third-party advertising trackers, and we do not require an account to use any tool on the site.

Frequently asked questions

How accurate is the Navy method?+

Within roughly ±3 % of DEXA for most adults. It's the industry standard for a no-equipment estimate.

Do you store my measurements?+

No — everything runs in your browser and nothing is sent to a server.

Do I need to create an account to use Toolzer?+

No. Every utility on Toolzer is free, anonymous, and works in any modern browser without registration. You will never see a paywall or a forced sign-up flow — the goal is to give you the answer on the first screen and let you move on.

Is Toolzer safe to use with sensitive inputs?+

Yes. Whenever the tool can produce an answer entirely in the browser — password generation, JSON formatting, regex testing, hashing, text counting — the data never leaves your device. When a server lookup is unavoidable (DNS, WHOIS, geolocation), the request is proxied through Toolzer's edge so the upstream service never sees your real IP address.

Does Toolzer work on mobile?+

Yes. The interface is fully responsive and works on iOS Safari, Android Chrome, Samsung Internet, and every other up-to-date mobile browser. You can pin the page to your home screen for one-tap access.

Can I link to or bookmark a result?+

Yes. Every Toolzer page has a clean, permanent URL you can bookmark, share, or paste into a ticket. Results are generated client-side on each visit, so the link always shows fresh data instead of a stale screenshot.