Atmospheres (standard) to gigapascals converter above calculates how many gigapascals are in 'X' atmospheres (standard) (where 'X' is the number of atmospheres (standard) to convert to gigapascals). In order to convert a value from atmospheres (standard) to gigapascals (from atm to GPa) simply type the number of atm to be converted to GPa and then click on the 'convert' button.