measurements by use of a conventional caliper process require skills and experiences . further , since different pregnant women gain and keep fats in their bodies in different ways , results of measurements of their body fats vary . to overcome the inconvenience , there is provided a system for measuring a percent body fat or a total body fat by a bioelectrical impedance method , which comprises first input means , second input means and computation means , wherein personal data of a patient such as a height and a body weight is input into the first input means , a weight of a fetal part is input into the second input means , and the computation means computes a percent body fat or a total body fat by subtracting the body weight input into the second input means from the body weight input into the first input means . further , to overcome the inconvenience , there is provided a system for measuring a percent body fat by a bioelectrical impedance method which comprises first input means , second input means and computation means , wherein personal data of a patient such as a height and a body weight is input into the first input means , a weight of a fetal part is input into the second input means , and the computation means computes a percent body fat by subtracting the body weight input into the second input means from the body weight input into the first input means .