B3

The B3 paper size is part of the ISO B series used for large-format documents and visual presentations. With dimensions of 353 x 500 mm, B3 is the fourth largest size in the B system. It maintains the unique height-to-width ratio of 1:√2 (approximately 1:1.4142) that enables efficient scaling while preserving the aspect ratio.

With a surface area of 0.18 square meters, B3 provides a substantial yet portable printing space. Its size makes B3 suitable for posters, charts, infographics, and technical drawings requiring manageable large dimensions. The origins of B3 date back to the German DIN 476 standard from 1922 before being officially adopted as an ISO standard in 1975. Today, B3 is commonly used in architecture, engineering, manufacturing, and graphic design for presenting visual information and plans across posters, manuals, and media. Its versatility between size and portability establishes B3 as a practical large format.