



Paper SizesFrom Draftsperson.netBy David The ISO 'A' Series The ISO 'A' series of sheet sizes is based on a constant width to length ratio of 1:2. 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 ... 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



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