In this study, the uncertainty in the ballistic test was calculated. Characteristic factor plots were used to identify the sources of uncertainty. The results are as follows. First, the uncertainty about the projectile was calculated to be 0.008m/s. Second, the uncertainty for depth measurement was calculated to be 0.03mm. The biggest factor influencing the uncertainty was the human error by the measurer. Therefore, in order to reduce the uncertainty, it is necessary to minimize human intervention by introducing automatic measuring equipment.