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Paper and Card sizes are generally organised through an 'A' system in an ascending sequential order. The main thing to remember is the lower the number, the bigger the size – the largest size being A0. For example, A1 measures half the size of A0, A2 measures half the size of A1, and so on. Below is a diagram showing you the 'A' system in full, plus a sizing chart containing all the measurements you'll need.
'A' System Size Chart
|A0||841mm x 1189mm||33.1" x 46.8"|
|A1||594mm x 841mm||23.4" x 33.1"|
|A2||420mm x 594mm||16.5" x 23.4"|
|A3||297mm x 420mm||11.7" x 16.5"|
|A4||210mm x 297mm||8.3" x 11.7"|
|A5||148mm x 105mm||5.8" x 8.3"|
|A6||105mm x 148mm||4.1" x 5.8"|
|A7||74mm x 105mm||2.9" x 4.1"|
|A8||52mm x 74mm||2.0" x 2.9"|
|A9||37mm x 52mm||1.5" x 2.0"|
|A10||26mm x 37mm||1.0" x 1.5"|