Glossary of Printing Terms:
ISO Paper Sizes

The International Organization for Standardization Paper Sizes

European standard paper size standard. The most common of which is the ‘A’ series.

The aspect ratio of ISO paper sheets is 1 to 1.414.

This means that if you cut a sheet into halves they will be the same proportion as the original. In other words a sheet of A3, when cut in half, will give two sheets of A4.

There are are also B and C size papers and the larger RA and SRA paper sizes, which are allow printers to print oversize sheets that can be trimmed to ‘A’ size for commercial use.

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