Kilocalories per second to gigawatts conversion calculator above calculates how many gigawatts are in 'X' kilocalories per second (where 'X' is the number of kilocalories per second to convert to gigawatts). In order to convert a value from kilocalories per second to gigawatts (from kcal/s to GW) type the number of kcal/s to be converted to GW and then click on the 'convert' button.