Know your Paper Sizes

The basic rule to remembering paper sizes is that as the sheet becomes smaller, the number becomes bigger. For example A4 folded in half becomes A5. The dimensions of the A series paper sizes, as defined  by ISO 216, are shown  in the table below.

Whilst there are paper sizes larger than A0 (2A0 and 4A0), these are not  recognised   by  ISO  216 but instead by the German DIN 476.

ISO  216 specifies  tolerances  for the production  of A series paper sizes as follows:

• ±1.5mm for dimensions up to
150mm.

• ±2.0mm for lengths in the range 150 to 600mm.

• ±3.0mm for any dimension above 600mm.

The A series paper sizes are defined in ISO 216 by having the following requirements:

• The length divided by the width is 1.4142.

• The A0 size has an area of 1 square metre.

• Each subsequent  size A(n) is defined as A(n-1) cut in half parallel to its shorter sides.

• The standard length and width of each size is rounded to the nearest millimetre.

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