The standard size for most printers is 8.5 x 11 inches, also known as letter size paper. This is the size used for a wide range of standard documents, including office documents, letters, and faxes. Legal-sized paper, which measures 8.5 x 14 inches, is the second most common paper size. The third most common size of paper is 11 x 17 inches, also known as tabloid or ledger size.