Preoperative templating has become more valuable and important recently that the limb length discrepancy that can happen after total hip arthroplasty not only causes the adverse effects such as increased energy expenditure in gait, cosmetically disturbing gait, scoliosis, low back problems, and late degenerative arthritis of the opposite hip but also can evoke legal problems. In order to find out whether we can minimize the severity and the frequency of postoperative limb length discrepancy by using preoperative templating, we studied the differences between preoperative templating done before total hip arthroplasty and postoperative assessment. Preoperative predictive value of corrective change of leg length was +4.9 mm, postoperative assessed value of corrective change of leg length was +4.7 mm on an average, showing that the difference between them is only 0.2 mm. Preoperatively planned sizes of acetabular cup and femoral stem templating showed high coincidence rate with those sizes used intraoperatively. Therefore, an accurate and careful preoperative templating can lead to reconstructing balanced hips by the intended correction of leg length differences.