An apparatus for performing repeatable, accurate compound miter cuts takes the form of a gauge and associated plate that are attached to a conventional miter saw. The gauge includes a pair of hinged flaps that are adjustable so that the user can move the two flaps to correspond to the measured lean angle and the measured miter angle, creating the proper three-dimensional orientation for the compound miter cut. A separate plate member is attached to the saw itself (in a plane parallel to the saw blade), and is used as a guide to align the blade to the gauge. An associated set of pivot stops (for both the arm and the table) are used in conjunction with the gauge and the plate to form all possible combinations of inside and outside angles in a repeatable manner without needing to perform any calculations of the angles.

An apparatus for performing repeatable, accurate compound miter cuts takes the form of a gauge and associated plate that are attached to a conventional miter saw. The gauge includes a pair of hinged flaps that are adjustable so that the user can move the two flaps to correspond to the measured lean angle and the measured miter angle, creating the proper three-dimensional orientation for the compound miter cut. A separate plate member is attached to the saw itself (in a plane parallel to the saw blade), and is used as a guide to align the blade to the gauge. An associated set of pivot stops (for both the arm and the table) are used in conjunction with the gauge and the plate to form all possible combinations of inside and outside angles in a repeatable manner without needing to perform any calculations of the angles.