Abstract: A picture hanging position marking tool is disclosed having a relatively flat, elongated support arm is a marking orifice at the distal end opposite a support arm handle. The marking orifice is bounded at its lower edge by a support cam, pivotally affixed to one side of the support arm. The support cam is comprised at its upper edge of a first hanger support ridge formed parallel to a second hanger support ridge. The two hanger support ridges bound a marking cavity between. Measuring indicia are provided along the length of the support arm, and a bubble level is located horizontally within the handle.