What It Is Girth measurements are circumference measurements taken at a specific body site and recorded. They are converted to a constant and then entered into a formula to predict percent body fat. The sites measured differ depending on a person's age and gender.
Women measure the abdomen, right thigh and right forearm.
Done Clothing is removed to make sure measuring tape is positioned correctly. The non-stretchable tape is placed evenly around each site that is measured. For each site, the length of the non-stretchable tape defines the circumference. The measurements correspond to various conversion constants that are entered into a formula to predict percent body fat. Pulling the tape too tightly or leaving it too loose is a significant source of error in the measurement.