Facial symmetry and averageness are key components in quantifying the perception of beauty. In this study, a prototype Augmented Reality (AR) tool is developed on Android OS, to assist plastic surgeons and patients in objectively assessing facial symmetry when planning reconstructive surgical procedures. Speci cally, the tool overlays 4 types of measurements and guidelines over a live video stream to provide the users with useful information interactively. The measurements are computed from the tracked facial landmarks at run-time.