9 5 14 Design And Dimensional Standards The procedure of converting square inches to square feet or from acres to sq ft is the same as converting from square meters to square feet In the following examples, you willUsual values range from 1/16 to 1/2 an inch (2mm to 13mm) and the size varies depending on materials used and the intended design For example, uniformly cut granite tiles allow for much 45 x 500 cm in square feet