Atmospheres (standard) to hectopascals conversion calculator shown above calculates how many hectopascals are in 'X' atmospheres (standard) (where 'X' is the number of atmospheres (standard) to convert to hectopascals). In order to convert a value from atmospheres (standard) to hectopascals (from atm to hPa) just type the number of atm to be converted to hPa and then click on the 'convert' button.