Fitness
Body Fat Calculator
Estimate body-fat percentage with the U.S. Navy method.
Free to use — no sign-up or login.
Body fat
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Amortization schedule
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This free Body Fat Calculator covers Estimate body-fat percentage with the U.S. Navy method.
The Navy method estimates body fat from circumference measurements and height. Related fitness tools sit beside How it works, with no account required.
Using the Body Fat Calculator
Estimate body-fat percentage with the U.S. Navy method. Typical inputs are Units, Sex, Height (cm) and Waist (cm). How it works beside the form states the identity the Body Fat Calculator applies.
Worked example
The Navy method uses logarithms of circumference and height. Measure waist at the navel, neck just below the larynx, and (for the female formula) hips at the widest point. Keep units consistent with the selected metric/US mode.
FAQ
Is Navy body fat the same as DEXA?
No. Circumference formulas are estimates. DEXA, hydrostatic weighing, and similar methods can differ by several percentage points.
Why is hip circumference required?
The female Navy equation includes hip circumference. The male equation uses abdomen and neck only; unused fields do not enter that formula.
Sources
Assumptions and limitations
These fitness results are not a medical diagnosis or treatment plan. They use the named screening formulas only and cannot replace advice from a qualified clinician.
Tape placement and posture change the result. This is not a clinical body-composition test.