🏃 Body Fat % Calculator (US Navy Method)
What is the Body Fat Calculator?
This calculator estimates your body fat percentage using the US Navy circumference method, which uses tape-measure measurements instead of expensive equipment. Enter your height, neck and waist circumference (plus hip circumference for women), and weight, and it returns your estimated body fat percentage, category, and fat mass in kilograms.
How to Use It
Select the Male or Female tab, measure your neck and waist at their widest points with a tape measure (add hip measurement for the female tab), and enter your height and weight. Click "Calculate" to see your estimated body fat percentage, whether you fall into Essential, Athlete, Fitness, Average, or Obese category, and your total fat mass.
When to Use It
Use it to track body composition changes over time alongside a diet or training program, since body fat percentage often tells a more useful story than weight alone when you're building muscle while losing fat. It's also useful when BMI gives a misleading result, such as for muscular athletes who register as "overweight" by BMI despite low body fat.
Who Benefits
Athletes and gym-goers tracking body composition, dieters who want a metric beyond the scale, and anyone curious how their body fat compares to standard fitness categories for their sex. For higher precision, a DEXA scan or hydrostatic weighing beats any at-home method, including this one.