An angle gauge comprising multiple surfaces around its perimeter, each of which provides for two or more fixed sharpening angles; each angle incorporating angular compensation for workpiece thickness and variations in peripheral grinding wheel diameter in order to quickly and accurately set an angular relationship between an curved or planar abrasive surface and a tool rest. The angle gauge has no moving or adjustable parts and is separate from both the grinder and the tool rest. The angle gauge may also be attached to a holder allowing for angle setup when the workpiece cannot be supported by a platform or tool rest.