Recently, the lightweight paradigm has emerged in the automobile industry. Moreover, there are three main methods for reducing the weight of the control arm during design. The first method involves using lighter materials in place of heavy ones. The second method is via optimization analysis technique using CAE. The third is via correlation, which checks the correlation between CAE results and actual testing. Because the CAE includes a safety rate, checking the difference between the actual tests and reducing the weight based on the difference are possible. The forged control arm can be thickened using mold open tolerances, the strength range of the mold open tolerance can be determined, and the optimal strength can be derived. The optimal strength control arm derived from the correlation reduces the ratio compared with the existing design, which can lead to weight reduction.