Gigawatts to calories per hour conversion calculator shown above calculates how many calories per hour are in 'X' gigawatts (where 'X' is the number of gigawatts to convert to calories per hour). In order to convert a value from gigawatts to calories per hour (from GW to cal/h) type the number of GW to be converted to cal/h and then click on the 'convert' button.