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Body Fat Calculator

Estimate your body fat percentage with the US Navy method from height, neck, waist and hip measurements.

How to use

Estimate your body fat percentage with the US Navy method, which uses height, neck and waist measurements (plus hips for women). The result is placed in a category from essential fat to obese. Tape-measure methods have a margin of error of a few percentage points, so track changes over time rather than a single number.

  1. Enter your details.
  2. Results update instantly.
  3. Adjust the values to see how they change.

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Frequently asked questions

How do I measure correctly?

Measure your waist at the navel (men) or the narrowest point (women), your neck below the larynx, and your hips at the widest point, with a tape that is snug but not tight.

How accurate is the Navy method?

It is an estimate with an error of a few percentage points compared with scans such as DEXA, so it is best for tracking trends.

Is it free?

Yes. Everything is free, with no sign-up and no limits.

Is my data stored or sent?

No. Calculations run in your browser and nothing you enter is sent or stored.

Can I rely on these results?

They use standard published formulas and give estimates for general information.

For general information only. This is not medical advice. Talk to your doctor, midwife or dietitian about your own situation.