How is this calculated?

Using the US Navy circumference equations — based on height, neck, and waist (plus hip for women). Accurate to ±3-4% vs. DEXA for most people.

How do I measure correctly?

Neck: just below the Adam's apple. Waist: at the navel (men) or narrowest point (women). Hip (women): at the widest point. Tape snug but not compressing skin.

What's a healthy body fat range?

ACE rough categories — Men: essential 2-5%, athlete 6-13%, fit 14-17%, acceptable 18-24%, obese 25%+. Women: essential 10-13%, athlete 14-20%, fit 21-24%, acceptable 25-31%, obese 32%+.

Is this medical advice?

No. This tool is for informational purposes only and is not a substitute for advice from a registered dietitian or physician.

Body Fat Percentage Calculator

Health & Fitness· 18 tools

Free body fat percentage calculator using the US Navy circumference method. Enter height, neck, and waist (plus hip for females) — no calipers or scales needed.

Sex

Units

Height (cm)

Neck (cm)

Waist (cm)

Body Fat (US Navy method)

16.9%

Fitness

Essntl

Athlete

Fit

Avg

Obese

Informational estimate only. Not medical advice. Accuracy varies ±3-4% vs. DEXA.

Disclaimer: For informational purposes only. This is not medical advice — consult a qualified healthcare provider for personal recommendations.

Frequently Asked Questions

References

Body composition measurement techniques — National Institute of Diabetes and Digestive and Kidney Diseases
Assessing your weight — body fat overview — Centers for Disease Control and Prevention

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Frequently Asked Questions

References and sources

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