## B0 size is worldwidely used by professional printers, even if it is less used than A0. It is used for posters or enlarged text or photos. It is indeed a format that lends itself more to display than writing.

The B0 format is 2 B1 sheets or 4 B2 sheets. Unlike the A0 size (2A0, 4A0), B0 has no larger non-standardized size. It is actually the largest in its range. Like all B formats, B0 was standardized by ISO 216. It dates from 1975 and is a former German Standards(DIN 476 from 1922), that took its own origin in a letter written in 1786 by Lichtenberg. He then invented the √2 ratio, which now allows to use A, B and C sizes.

The same ratio is maintained between all B sizes: length = width x √2 (a/b = 2 b/a = √2, length is 1.4142 times the width). This proportion keeps the content’s proportions when we reduce or enlarge it by copying.

The width of a B0 corresponds to the length of a B1. Dimensions of size B0 are: 100 x 141.4 cm or 39.37 x 55.67 inches. This gives a surface of 1,414 m² or 1.67 square yards, 15.07 square foot or 2170 square inches.

A B0 sheet is obtained by putting together two B1 sheets along their length.

To calculate the weight of a B0 sheet, we must know the weight of the paper and refer to the surface of 1.414 m². For a paper of 100 g/m², it will be a sheet of 1.414 x 100 B0 = 141.4 grams.