Arch C

The Arch C paper size measures 18 inches wide by 24 inches tall, giving it a large surface area of 432 square inches. As the third size up in the architectural series, Arch C provides substantial space for more expansive architectural drawings and schematics. Its 4:3 aspect ratio makes it identical in shape to Arch A, scaled up by a factor of two. The squared shape allows efficient use of area for floor plans and orthogonal drawings. Typical uses for Arch C include master building plans, expanded floor layouts with multiple rooms, and external elevation drawings needing extra height. The 18x24 size can fit four Arch A sheets or two Arch B sheets. Arch C is a good midpoint between the portability of smaller architectural sizes and large-format drafting sizes. It can accommodate significant detail and multiple views on a single sheet.