PA3

With dimensions of 280mm x 420mm, the PA3 format has a total surface area of 0.1176 square meters. As part of the transitional PA paper size series conceived in 1975, PA3 falls between PA2 and the standard A3 size from ISO 216. Its landscape orientation makes PA3 well-suited for more horizontal applications compared to A3. Like other PA sizes, its 1:√2 aspect ratio allows for efficient scaling. PA3 has no commonly used alternative names, but its width and height correspond roughly to Arch B and Arch C formats respectively. Typical uses taking advantage of the considerable area of PA3 include oversized brochures, promotional posters, or artistic prints. Since the PA series was created specifically to supplement the limited ISO 216 standard sizes, PA3 does not have a rich history of its own but persists in filling a transitional niche between PA2 and A3. Its landscape orientation lends utility for spreading content across a wide page, especially for graphical or visual applications. While rejected alongside the rest of the PA series for official standardization, PA3 continues to serve key functions bridging the gap where A3 leaves off for horizontal presentations demanding more space.