Free Body Fat Calculator

Body fat % via US Navy method.

Sex

Height (cm)

Neck circumference (cm)

Waist circumference (cm)

16.9%

Fitness

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How to use the Body Fat Calculator

1Choose sex.
2Enter height, neck, waist (and hip for women).
3See body fat % and category.

Features

Navy formula
Category display
Metric & imperial

Frequently Asked Questions

How accurate is the Navy method?

Within ~3–4% for most people when measured carefully — comparable to consumer BIA scales.

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About the Body Fat Calculator

Estimate body fat percentage using circumference measurements (US Navy formula). The Body Fat Calculator runs entirely in your browser — your data is processed locally and never uploaded to a server. Explore more Calculators tools or browse all free online tools.