The US Navy Body Fat Calculator is a reliable tool to calculate your body fat percentage based on the US Navy method. This method takes into account measurements of your neck, waist, and height (and hip circumference for women) to estimate your body fat percentage. It is widely used in fitness and health assessments due to its simplicity and accuracy. While it provides a fairly accurate estimate, the margin of error is typically around 2-4%, depending on the precision of the measurements and individual body types. Enter your details below to find out your body fat percentage.