In this article, a concise and practical analytical method of transmitted torque calculation for pre-design of Axial Permanent Magnetic Coupler (APMC) by combining Faraday's law with magnetic circuit model is proposed. The proposed method is able to consider the three-dimension (3D) edge magnetic effect as well as the induced magnetic field generated by eddy currents. The correctional skin depth factor is also taken into consideration. In order to verify the validity of the proposed method, the 3D finite element method (FEM) is employed. The results present that the relative error between the proposed method and 3D FEM in the normal working slip range is within 5.2%. Finally, detailed analysis is carried out to investigate the influence of the common parameters on the transmitted torque for APMC. Moreover, the deficiencies of this proposed method and the corresponding design considerations are also discussed, which offers useful and auxiliary information for the pre-design of APMCs.