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According to my calculations the average size of a piece of computer paper is approximately 8.5 inches by 11 inches. best to go to a printer shop, save your image to a disc or sd card, look up the number for a local printer and call to find out how much they will charge, A3 paper will probably be large enough.
A0 is a less commonly used standard of paper due to its large size. The ISO 216 standard defines A0 size to be 841mm Ã 1189mm, which is also exactly double the size of an A1 and is also the largest size in the A series.