Abstract: An improved apparatus and method are provided for measuring body fat of a live subject. The apparatus comprises a current source connected in parallel with two or more reference resistors and with the subject's body. The connections to the body are made via an array of electrodes. The resistors and the subject's body are switched in and out of the circuit, and the various voltages across the resistors and the body are detected by a voltage drop measuring device and input to an analog-to-digital convertor (ADC). The output from the ADC is presented to a microprocessor control unit, which calculates (1) the impedance of the individual's body based upon the various voltage measurements, and (2) the percent body fat as a function of that impedance and other ariables such as height, weight, age, and sex.