Abstract: A drywall square having a straight long arm of at least forty-eight inches. The long arm has a first end and a second end, wherein the long arm is segmented into a plurality of sections between those ends. A straight short arm intersects the long arm. A first hinged joint connects the first end of the long arm to the short arm. The first hinged joint enables the short arm to be oriented at a perpendicular to the long arm or folded in parallel atop the long arm. The sections of the long arm are also connected by hinged joints. This enables the sections of the long arm to be unfolded into a linear configuration or folded together into a neat stack. Connectors are also provided that are used to retain the square either in its fully open configuration or its fully folded configuration.