Body Fat % Calculator
US Navy circumference method from simple tape measurements.
Enter your measurements to estimate body-fat percentage.
About the Body Fat % Calculator
Body-fat percentage tells you how much of your weight is fat versus muscle, bone, and water — often more informative than scale weight alone. This tool uses the US Navy circumference method, which estimates body fat from tape measurements of your neck and waist (plus hips for women) together with your height. It’s a convenient at-home estimate, not a lab-grade reading like a DEXA scan, but it’s consistent enough to track changes over time. Measure at the same time of day and in the same way each time for the most reliable trend.
Educational estimate only — not medical advice. For personalized guidance, consult a qualified healthcare professional.