In this case to convert 5.5 x 8.5 inches into cm we should multiply the length which is 5.5 inches by 2.54 and the width which is 8.5 inches by 2.54. The result is the following: 5.5 x 8.5 inches = 13.97 x 21.59 cm. Definition of inch. An inch (symbol: in) is a unit of length. It is defined as 1⁄12 of a foot, also is 1⁄36 of a yard.
