Body fat % calculator
US Navy circumference estimate from tape measurements. Not a DEXA scan.
Runs in this tab. The file stays here.
US Navy estimate
16.9%
Tape-measure method. Meaningfully less accurate than DEXA or calipers.
This runs in your browser. Nothing is uploaded.
About Body fat % calculator
US Navy circumference body-fat estimate from tape measurements in centimetres. Not a DEXA scan.
This body fat calculator stays in the tab. Nothing is uploaded to ihateonlinetools.com for the calculation. That is the same offline promise as the rest of the site: your numbers, caption, or recipe never need to sit in a third-party form log.
The US Navy circumference method uses logarithms of waist, neck, height, and for women hip, all in centimetres. The output is a percentage estimate meant for tape measures, not for clinical decisions.
DEXA and calipers are more accurate. The page states that on purpose so nobody treats the number as a diagnosis. Waist must exceed neck for the male formula to be defined. Related tools on this site cover nearby jobs without forcing a signup wall.
How to use Body fat % calculator
- 1Open /health/body-fat-calculator/ and check the side-panel defaults.
- 2Enter your values or paste your list; the main pane updates.
- 3Copy the result if you need it elsewhere. Closing the tab clears local state unless noted.
What it won't do
- Not professional advice and not a hosted account product.
- Garbage in, garbage out: wrong inputs yield wrong outputs.
Common questions
Does body fat calculator upload anything?
No. Inputs and outputs stay in the browser process. Sharing features that exist, such as countdown links, only put values you choose into the URL on your device.
What formula or method does body fat calculator use?
The US Navy circumference method uses logarithms of waist, neck, height, and for women hip, all in centimetres. The output is a percentage estimate meant for tape measures, not for clinical decisions.
When should I not rely on body fat calculator alone?
When a clinician, building code, platform policy, or teacher requires a signed process. This page is a calculator and explainer, not a certificate.
Is body fat calculator free and offline-capable?
Yes. After the static page loads, the logic runs without calling an external compute API. Return visits may use the service worker cache for the shell.
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Why this one doesn't upload your file
There is no server to upload to. This page is a static file, and the work happens in your browser using the same graphics and WebAssembly code that renders every other site you visit. Your file is read from disk into memory, processed, and handed back as a download. Once the page has loaded you can disconnect from the network entirely and it keeps working. The longer explanation