Abstract: A layout tool is provided for anchoring a layout line, such as a chalk line, in relation to a piece of construction material. The tool (100) generally includes a top plate (102) and a depending plate (106). Angular markings (104) are provided on the top plate (102) to indicate angles, pitches, or the like. The tool (100) further includes an anchor post (110), a spike (108), and a window or opening (112). A construction worker can align the tool (100) with a mark on the construction material by viewing the mark through the opening (112). The worker can strike the plate (106) so that the spike (108) penetrates a side surface of the construction material to secure the tool (100) in the desired position. A chalk line can then be attached to the post (110) and extended a desired length across the construction material in a desired angular orientation by using the markings (104). The chalk line can then be snapped against the construction material to provide a desired layout chalk line.