Abstract: A window treatment hanging tool is made up of two right angled shaped guide components. The first guide component has dual arms positioned perpendicular to each other, each with channeled pathways. The second guide component also has dual arms in perpendicular relation to each other, each arm having an elongated member which is adapted to be slideably and adjustably insertable within the pathways of the first guide component. Each guide component also has measurement markings. Properly positioning the guide components on or within windows or window frames allows proper alignment and lateral equidistance positioning of a window hanging treatment support in relation to the window or window frame.