Body Fat Estimator
Estimate body fat percentage using the U.S. Navy tape method with cm measurements.
Last reviewed by the Radiatus Cloud team
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Estimate body fat from measurements
Body fat percentage tells you more than weight, and the US Navy method estimates it from tape measurements. This estimator uses that method with centimetre measurements to estimate your body fat percentage.
Why the tape method works
Precise body fat measurement needs specialist equipment, but the US Navy method estimates it well enough from simple circumference measurements, neck and waist, plus hips for women, combined with height, because fat and lean tissue distribute in predictable ways. It is far more accessible than a body scan, which is why it is widely used, and it is reasonably consistent if you measure carefully at the same points each time.
A health estimate
This is an estimate from a standard formula for general information, not medical advice; individual health depends on far more than any single number, so consult a professional for anything that matters. It runs entirely in your browser, so nothing you enter is uploaded, keeping your figures on your own machine.
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Frequently Asked Questions
How does the US Navy method work?
It estimates body fat from tape measurements, neck and waist plus hips for women, combined with height, using a formula that correlates them with body fat.
Why use tape rather than a scan?
Because a tape measure is accessible to anyone, while precise methods need specialist equipment. The method trades a little accuracy for practicality.
How accurate is it?
A reasonable estimate when you measure carefully at consistent points. It is less precise than a lab method but far more accessible.
Does it differ for men and women?
Yes. The measurements differ, with hips included for women, reflecting how body fat distribution differs.
Is this medical advice?
No. It is a general estimate. Consult a professional for an accurate assessment.
Privacy & Security
Calculated locally in your browser. No data is sent to any server.
How to Use
Enter measurements (height, neck, waist, and hip for women) to estimate body fat.
Disclaimer: This tool is provided "as is" without warranty of any kind. Results are for educational and utility purposes.
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