Body Fat Calculator
Estimate your body fat percentage using the U.S. Navy circumference method.
U.S. Navy method
We use the highly regarded U.S. Navy Method for estimating body fat percentage using simple circumference measurements.
- Men:
%BF = 86.010 ร log10(waist โ neck) โ 70.041 ร log10(height) + 36.76 - Women:
%BF = 163.205 ร log10(waist + hip โ neck) โ 97.684 ร log10(height) โ 78.387
Formulas expect inputs in inches. Our calculator automatically converts metric inputs for you.
Frequently Asked Questions
Is the Body Fat Calculator free to use?
Yes, the Body Fat Calculator is 100% free to use. There are no subscriptions, no sign-ups, and no hidden fees.
Is my data safe when using the Body Fat Calculator?
Absolutely. All calculations performed by the Body Fat Calculator happen locally in your web browser. We do not store, track, or transmit your inputs or results to any server.
How accurate is the Body Fat Calculator?
Our Body Fat Calculator uses industry-standard formulas and methodology. You can view the exact formula and calculation logic used in the methodology section above to verify the math yourself.
Can I use the Body Fat Calculator on my mobile phone?
Yes! The Body Fat Calculator is fully responsive and works seamlessly on all devices including smartphones, tablets, and desktop computers.