In mold induction heating is proving to be an efficient method of producing high quality low cost injection molded parts. Autodesk Moldflow is the world leader in plastic injection molding simulation products. RocTool is the foremost technology provider of induction heating equipment for plastic injection and compression molding. Autodesk Moldflow and RocTool have collaborated to develop a three dimensional finite element simulation of the Maxwell equations for the induction heating process in plastic injection molding. This paper describes the key features of this electromagnetic solver together with validation results from tests conducted on existing molds. In order to simulate induction heating a true three dimensional finite element solution of both the real and imaginary components of the Maxwell equations was obtained, without any simplifications or assumptions. The derivation and the numerical techniques used in implementing this unique solution of the Maxwell equations on the injection mold domain are presented. Simulation of induction heating offers the mold designer an insight into the mechanisms of induction heating. Induction heating creates a very hot non-uniform temperature distribution concentrated in the surface skin of the mold body very quickly. Ideally the surface skin layer touching the part is at the material’s melt temperature during the filling phase of the injection molding cycle. With most of the heat concentrated in the very thin skin region of the mold touching the part, the mold can be cooled down to ejection temperature very quickly thereby, ensuring a desired short cycle time. In the paper, induction heating simulation is demonstrated on a real world model. The simulated results are compared to results provided by RocTool that were measured in their test facility. Any discrepancies between the simulated results and the experimental results are discussed in detail.