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Body Fat Calculator (US Navy)

Estimate body fat percentage with the US Navy circumference method.

01 / INPUTS

cm
cm
cm
cm

02 / RESULT

BODY FAT

19.81%

Body fat
19.81%

Calculation trace

  1. 495 ÷ 1.05361 − 450 = 19.81%
    19.81 %
    US Navy circumference formula
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How it works

The U.S. Navy circumference method (Hodgdon-Beckett, 1984) estimates body fat from height and tape measurements. Men use neck and waist; women add hip. Values use base-10 logarithms.

Assumptions & limits

  • A circumference estimate; typical error is a few percentage points versus hydrostatic weighing.
  • Measure snugly and consistently in centimetres.
  • For general fitness and education only — not a medical or diagnostic tool.
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FAQ

Why do women need a hip measurement?
The female equation includes hip circumference (waist + hip − neck) to improve accuracy for typical fat distribution.
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