Online Body Fat Percentage Calculator. How to Find Your Body Fat Percentage The following body fat calculator uses the U.S.
Navy Circumference Method where three or four body measurements are fed into a formula to estimate the percentage of your body that is made up of fat. Many thanks to Stephen Chapman, About's Guide to Javascript. The measurements need to be accurate to within 0.5cm or 0. 25 inches (centimeters tends to produce the most accurate results) and should be taken as follows: Height: taken without shoes Neck: taken below the larynx sloping slightly downward at the front Waist: for men at navel height, for women at the smallest point Hips: (women only) at the largest point.