Abstract: A carpenter's layout tool has various measurements thereon, which measurements are used during stud wall construction. The tool has a pair of feet, each with a centrally disposed opening, the feet being joined at a lower surface of each by a connecting bar. The connecting bar has measurements, both left justified and right justified, for joining corner marks, corner marks, and intersecting wall marks, using either 2×4 or 2×6 inch construction. The tool is dimensioned so that the feet provide stud spacing with one of the openings in the respective foot being used for measurement initialization.