Gigapascals to pounds per square foot conversion calculator shown above calculates how many pounds per square foot are in 'X' gigapascals (where 'X' is the number of gigapascals to convert to pounds per square foot). In order to convert a value from gigapascals to pounds per square foot (from GPa to psf) type the number of GPa to be converted to psf and then click on the 'convert' button.