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Body Fat Calculator

❤️ Health & Fitness

Estimated body fat percentage.

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ΣBody Fat % Formula (Navy Method)

Formula
Male: BF% = 86.01 × log(abdomen − neck) − 70.041 × log(height) + 36.76
VariableDescription
BF%Body fat percentage
abdomenWaist circumference at navel (cm)
neckNeck circumference (cm)
heightHeight (cm)
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Healthy range: Men 10–20% | Women 18–28%

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About Body Fat Calculator

Our Body Fat Calculator is a free, accurate, and easy-to-use online tool that gives you instant results as you adjust the sliders — no page reloads, no sign-up, no charges. The formula is shown on this page so you understand exactly how your result is computed.

All calculations run in your browser using industry-standard formulas. Your inputs are never sent to any server — your financial and personal data stays 100% private. Use the "Share URL" button to save or share your calculation with inputs preserved in the link.

Frequently Asked Questions

What is a Body Fat Calculator?+

A Body Fat Calculator is a free online tool that instantly computes results as you adjust sliders. It uses standard industry formulas and shows visual charts.

Is the Body Fat Calculator free?+

Yes, completely free with no registration, no subscription, and no hidden charges. All calculations run in your browser.

How accurate is the Body Fat Calculator?+

Results are based on standard formulas and are accurate for planning purposes. Always consult a qualified professional for formal decisions.

Can I share my calculation?+

Yes! Click "Share URL" to copy a link with your inputs encoded. Anyone with the link will see the same result.

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Disclaimer: Results are for informational purposes only and do not constitute financial, medical, or legal advice. Always consult a qualified professional before making important decisions. Read full disclaimer →

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