Body Fat Calculator (Navy Method)
Estimate body fat percentage from tape measurements.
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How it works
The US Navy formula uses the logarithm of your height and of your waist minus neck (plus hip for women), all in cm. Measure the waist at the navel for men and at the narrowest point for women, and keep the tape snug but not tight. Accuracy is about ±3–4 percentage points, so use it to track trends. Example: with the default male values, body fat comes to 16.9%.
FAQ
Is this calculator free?
Yes. No signup is needed and nothing you enter is stored.
Is the result exact?
Results are rounded for display. For financial, medical, or legal decisions, confirm with a professional.
Do my numbers leave my device?
No. The calculation runs in your browser.