Miles per hour to centimeters per second converter above calculates how many centimeters per second are in 'X' miles per hour (where 'X' is the number of miles per hour to convert to centimeters per second). In order to convert a value from miles per hour to centimeters per second (from mph to cm/s) simply type the number of mph to be converted to cm/s and then click on the 'convert' button.