Abstract: Systems and methods for computer-implemented determination of an estimated roof surface area are disclosed. In an embodiment of the invention, an aerial roof image is retrieved and displayed for a user. One or more of a plurality of stored roof templates are displayed with the aerial roof image. One of the roof templates may be selected so as to select a corresponding clear frame model to be overlayed on the aerial roof image. Nodes provided at vertices of the clear frame model may be aligned with corresponding vertices on the aerial roof image to change the dimensions of the clear frame roof model by dragging and dropping the nodes. One or more pitch values may be selected for association with the clear frame model. An estimated surface area of the roof is calculated and displayed based on the area of the resulting clear frame model and the one or more pitch values.