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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.
A4 is the standard size of paper used for computer printouts and other uses. A4 paper is 210 Ã 297 mm. It has an area of 1/16 square metres. It is one of a series of pape â¦ r sizes starting with A0, which has an area of 1 square metre.  Another Answer The advantage of using A-series of paper sizes is that the height to width ratio remains constant throughout the series.hare to: A4 is approximately 297 mm by 210mm and has an area of exactly 1/16 sq m = 0.0625 sq m = 625 sq cm The A series of paper is based on the fact that they all have the same ra â¦ tio of width to length.