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Paper Sizes

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Revision as of 04:28, 27 October 2011; view current revision
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By David

The ISO 'A' Series

The ISO 'A' series of sheet sizes is based on a constant width to length ratio of 1:2.

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The A0 size is defined as having an area of one square meter. This allows paper weights to be expressed in grams per square meter.

Each smaller sheet size is exactly half the area of the previous size. ie. If you cut an A0 sheet in half you get two A1 sheets; If you cut an A1 sheet in half you get two A2 sheets; and so on ...

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This relationship of 1:2 is particularly important for reduction onto microfilm, or reduction and enlargement on photocopiers. All metric equipment including microfilm cameras, microfilm printers, photocopiers, and even drawing pen sizes, are designed around this ratio. This makes the process of archiving drawings, resizing, and modifying drawings easy.

Dimensions of Regular Sheets

Designation Dimensions
A0 841 mm x 1189 mm
A1 594 mm x  841 mm
A2 420 mm x  594 mm
A3 297 mm x  420 mm
A4 210 mm x  297 mm
A5 149 mm x  210 mm


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