This format was standardized following the adoption of ISO 216 in 1975. Sizes B were first defined by DIN 476 (German Institute for standards), then based on Lichtenberg’s ratio, using as an universal basis the square root of 2 as a proportion between length and width in all B formats = length = width x 1.14142.
B3 format is sized to accommodate human writing: 500 x 353 mm or 19.69 x 13.90 inches. Its total area is 0.176 m² The surface of B3 size can also be reported in square yard (0.21), in square foot (1.89) or in square inches (272.8).
B3 format is 1/s a B2 or ¼ a B1. However, it takes 2 B4 to form a B3 sheet, or 4 B5 sheets. To refer to the largest paper in ISO 216, B0, B3 format is 8 times smaller.
One can obtain the weight of one or more sheets of size B3 by comparing its range to paper weight. For example, for a paper of 160 g/m², size B3 sheet weighs: 0.176 x 160 = 28.16 grams.
or 353 x 500 millimeters
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