Terawatts to calories per second conversion calculator above calculates how many calories per second are in 'X' terawatts (where 'X' is the number of terawatts to convert to calories per second). In order to convert a value from terawatts to calories per second (from TW to cal/s) simply type the number of TW to be converted to cal/s and then click on the 'convert' button.