US Navy method — estimate body fat % from a few tape measurements.
Based on the U.S. Navy circumference method. Results are an estimate; consult a professional for medical decisions.
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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.
Fill in the input fields — the body fat calculator accepts numbers, dates, or units depending on the mode.
Pick the operation or unit you want (add, subtract, percentage, convert) using the toggles above the inputs.
The answer updates instantly as you type; no need to click a "calculate" button.
Copy the result to your clipboard or take a screenshot for reports, invoices, or homework.
Doing this calculation by hand every time is a waste of your attention. Body Fat Calculator keeps the math boring and correct so you can focus on the decision it feeds into. The formulas are transparent, the inputs are forgiving, and every result is deterministic — the same inputs always produce the same answer, which matters when you need to defend a number to a client or a manager. Toolzer's design philosophy is simple: privacy-first (no tracking, no accounts), performance-first (the page is interactive in under a second on a 3G connection), and honesty-first (no fake ratings, no dark patterns, no upsells). Body Fat Calculator follows the same rules as every other utility on the site. You can bookmark this page, share the URL with a colleague, or pin it to your browser's toolbar — the experience will be identical every visit, and it will keep working even if you're on airplane Wi-Fi. Real people use this tool for real work — freelancers cleaning up client deliverables, sysadmins triaging tickets, students finishing assignments — and it is tuned for those workflows, not for demo videos.
Within roughly ±3 % of DEXA for most adults. It's the industry standard for a no-equipment estimate.
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