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