Speed of light to centimeters per second conversion calculator shown above calculates how many centimeters per second are in 'X' speed of light (where 'X' is the number of speed of light to convert to centimeters per second). In order to convert a value from speed of light to centimeters per second (from c to cm/s) just type the number of c to be converted to cm/s and then click on the 'convert' button.