Gigawatt hours to gigacalories converter above calculates how many gigacalories are in 'X' gigawatt hours (where 'X' is the number of gigawatt hours to convert to gigacalories). In order to convert a value from gigawatt hours to gigacalories (from GWh to Gcal) simply type the number of GWh to be converted to Gcal and then click on the 'convert' button.