Abstract: A tool for laying out framing members includes a body comprising a blade and a tongue, the tongue oriented at a right angle to the blade in a common plane, wherein each of the blade and the tongue include indicia marking linear scales. Other indicia on the blade and tongue include information useful for building structures, such as roof structures. For example, indicia can include improved tables of data for marking and cutting rafters of various slope. Other indicia along the blade or the tongue indicate the length of the common rafter per foot of run as function of the slope.