Tested on iOS 7, 8, & 9
Calverter (Calculator-Converter) is a tweak that allows the user to obtain a hexadecimal representation or an octal representation of the value displayed in the calculator, or to paste in a hex/oct value to be displayed as decimal value in the calculator.
Note: You may need to double tap the calculator's display to view the copy/paste menu and then you will be allowed to long-press the display to view the menu.
No options to configure.