Abstract: A jig for use in conjunction with a router to cut circular openings is disclosed herein. The circular jig is comprised of a plate that has an escape hole for receiving a bit of the router therethrough, and a plurality of pivot holes formed therein. The plate has a reference point, and the pivot holes are arranged on the plate in a nonlinear array at preselected locations with respect to the reference point. A pivot pin inserted into the proper pivot hole allows the jig and router to be pivoted around the pivot pin and cut a circle of a preselected size.