Abstract: A gage, for determining the taper angle of the inner faces of the end walls of a continuous casting mold, includes a pair of rigidly connected, spaced apart, elongated, wall contact strips having parallel straight edges for engaging the wall for substantially its full height. A center, measuring strip is arranged between the wall contact strips and is pivotally connected to them at their lower ends. The measuring strip is pivoted by a manually operable screw that connects its upper end to the upper end of a wall contact strip. A level indicator mounted upon the top of the measuring strip indicates when that strip is vertical. A distance indicator gage mounted on the strips measures the amount of pivotal movement of the measuring strip until it becomes vertical. The taper gage is suspended in a mold and the wall contact strip straight edges are pressed against a mold end wall. Then the operator manipulates the screw to pivot the measuring strip until the level indicates that it is vertical.