Calculyn

Body Fat Calculator

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

in
in
in

Results update as you type.

Estimated body fat

17.5%

Fit

Estimated body fat17.5%

Health results are general estimates, not a diagnosis or a substitute for advice from a doctor or registered dietitian.

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How it works

The US Navy method estimates body fat from height and a few tape measurements. It's typically within 3–4% of lab methods. Women should also enter hip circumference. Educational estimate — not medical advice.

Formula

Men: 86.010·log₁₀(waist − neck) − 70.041·log₁₀(height) + 36.76
Women: 163.205·log₁₀(waist + hip − neck) − 97.684·log₁₀(height) − 78.387

Example

A man 70 in tall with a 34 in waist and 15 in neck is about 17.5% body fat.

Assumptions & limitations

  • Based on population formulas that may not fit athletes, pregnancy, children or medical conditions.

Frequently asked questions

How should I measure?

Measure the waist at the navel for men (narrowest point for women), the neck just below the larynx, and hips at the widest point.