The aim of the study is to develop a prototype of power factor measurement circuit. In the designed circuit, the power factor is measured using PIC16F877. This paper focuses to design the simple circuit and low-cost. The current and voltage signals of the load are measured at the same phase. Those signals are inserted into PIC16F877 by means of analog circuit. The power factor is calculated by the algorithm written on the PIC16F877. The measurement value of the power factor is displayed on the LCD screen.