B1

The B1 paper size is part of the ISO B series used for large-format documents and visual media. With dimensions of 707 x 1000 mm, B1 is the second largest size in the B system after B0. It shares the distinctive height-to-width ratio of 1:√2 (approximately 1:1.4142) that derives from halving the area of each successive paper size. This allows efficient scaling while maintaining the same aspect ratio.

With a surface area of 0.71 square meters, B1 provides a sizable printing space. Its substantial dimensions make B1 popular for posters, wide banners, large infographics, engineering drawings, and architectural plans. The history of B1 traces back to the German DIN 476 standard from 1922, before being officially adopted as an ISO standard in 1975. Today, B1 is commonly used across industries like architecture, manufacturing, advertising, and graphic design to showcase visuals and detailed plans on a grand scale. Its generous print area gives B1 an advantage over small paper formats.