Body Fat Calculator

This free body fat calculator estimates body fat percentage using the U.S. Navy circumference method, using neck, waist, height, and (for women) hip measurements. It's an estimate of body composition without needing calipers or a scan.

Fill in the fields above with your own numbers to get an instant, personalized result. This tool is for general informational purposes and is not a substitute for professional medical advice.

Frequently Asked Questions

What formula does this body fat calculator use?

It uses the U.S. Navy circumference method, using neck, waist, height, and (for women) hip measurements to calculate body fat percentage.

Is this medically accurate?

This tool gives a standard estimate based on the U.S. Navy circumference method. Individual results can vary, so treat it as a general guide rather than medical advice.