This paper aims to study the power coefficient of the Savonius wind turbine using Computational Fluid Dynamics (CFD) analysis. Power coefficient is one of the parameter of a wind turbine, to define the ratio between the actual wind power and the extracted power from rotor. 3D model of the Savonius wind turbine is required to analyze the power coefficient. The 3D model contains the height and diameter of the rotor. The height of the rotor in this research is 600mm and 580mm for the diameter. In this research, CFD is used to analyzed the behavior of Savonius wind turbine under the airfield conditions and to determine power coefficient of the wind turbine. The wind speed on the airfield was set to 5m/s with the angular velocity 5m/s. Power coefficient value of the simulation is 0.301 and from the theoretical calculation is 0.268. Comparison result of the power coefficient between simulation and theoretical calculation has error value 0.123%.