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Body Fat Percentage Calculator

Estimate body fat percentage using the US Navy tape-measure method.

To estimate body fat percentage, measure your neck, waist and — for women — hips, then enter them with your height. The US Navy circumference method is used, which typically lands within three to four percentage points of a DEXA scan.

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Runs entirely in your browser — nothing is uploaded
Cost
Free, unlimited, no sign-up

Frequently asked questions

How accurate is this?

The Navy method is usually within three to four percentage points of a DEXA scan for people of average build. It is less reliable at the extremes — very lean or very heavy — because the equations were fitted to a middle range.

How to use the body fat percentage calculator

  1. 1Choose the units.
  2. 2Choose the sex at birth.
  3. 3Set the height.
  4. 4Set the neck circumference.
  5. 5Set the waist circumference.
  6. 6Set the hip circumference.
  7. 7The result appears immediately — copy or download it.

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