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The most frequently used paper size is A4 measuring 210 by 297 millimetres (8.27 in × 11.7 in). The standard dimensions are rounded to the nearest millimetre.

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The A Series paper size chart, below left, gives a visual representation of how the sizes relate to each other - for example A5 is half of A4 size paper and A2 is half of A1 size paper.

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A4-size in cm, pixels, mm en inches. The A4 size is a commonly used paper size for writing paper, stationery, cards and documents. The size A4 reflects the size of a single sheet of paper.

An explanation of the paper size scale and magnification factors required for reducing and enlarging documents including A3 - A4 at 71%, A5 - A4 at 141%, B4 - A4 at 84% and A4 - B4 at 119%

A4 is the closest ISO 216 paper size to the old Imperial Foolscap size. A4 297mm (11.7") is slightly shorter than Foolscap Folio 330mm (13.0") and A4 210mm (8.3") is slightly wider than Foolscap 203mm (8.0").