Gigabars to gigapascals conversion calculator above calculates how many gigapascals are in 'X' gigabars (where 'X' is the number of gigabars to convert to gigapascals). In order to convert a value from gigabars to gigapascals (from Gbar to GPa) simply type the number of Gbar to be converted to GPa and then click on the 'convert' button.