Tons of oil equivalent to gigacalories converter above calculates how many gigacalories are in 'X' tons of oil equivalent (where 'X' is the number of tons of oil equivalent to convert to gigacalories). In order to convert a value from tons of oil equivalent to gigacalories (from TOE to Gcal) type the number of TOE to be converted to Gcal and then click on the 'convert' button.