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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.
The size of a ledger paper is 432 by 279 millimeters or 17 by 11 inches. Using the North American system, it is the biggest amongst the different paper sizes. After that comes the tabloid, a size with dimensions of 279 by 432 millimeters or 11 by 17 inches. The next one is the legal size, which measures 216 by 356 millimeters or 8.5 by 14 inches. The letter size measures 216 by 279 millimeters or 8.5 by 11 inches. The smallest size of paper is the junior legal, which only measures 203 by 127 millimeters or 8 by 5 inches.