In one example implementation, a system for ranking target dimensions includes a model engine to generate a three-dimensional (3D) model of an object from a scan of the object, an analysis engine to analyze the 3D model of the object and determine target dimensions of the object, a ranking engine to rank the target dimensions based on target dimension characteristics, historical scan information related to the target dimension characteristics, or a combination thereof, and a display engine to display information relating to the ranked target dimensions of the object.