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