ISO A paper sizes

The A-series consists of a logical set of paper sizes that are defined by the ISO 216 standard. The largest size (A0) measures one square meter. The height/width ratio remains constant (1:1.41) for all sizes. This means you get the A1 size by folding an A0 paper in two along its shortest side. Then fold the A1 size in two to get an A2 size paper, and so on… A-sizes are used to define the finished paper size in commercial printing. A4 is used for office documents. A6 is used for postcards.

ISO B paper sizes

The same logic from the A-sizes also applies for the B-series, except here the starting point was the dimension of one of the sides, which starts at 1 meter. B-sizes are often used for posters.

Oversize Papers

When your document is printed right to the edge of the paper( technically known as "bleed") your book must be printed on an oversize sheet and then trimmed down to the correct size. For example an A4 size book with bleed would be printed on an SRA4 (225 x 320mm) size sheet and then trimmed down to A4 (210 x 297mm)

Paper Size Comparison Diagram

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