Projects / Calcoo


Calcoo is a scientific calculator designed to provide maximum usability. Its features bitmapped button labels and display digits to improve readability, no double-function buttons, undo/redo buttons, copy/paste interaction with the clipboard, both RPN and algebraic modes, two memory registers with displays, displays for Y, Z, and T registers, and tick marks to separate thousands. Calcoo is written in C using the GTK+ widget library (v.2.2+).

Operating Systems

Recent releases

  •  19 Aug 2007 15:15

    Release Notes: Legacy GTK+ version 1 function calls were removed. No user-visible changes were made.

    •  15 Jul 2007 07:03

      Release Notes: An unsafe use of strcpy was fixed.

      •  28 Apr 2005 06:16

        Release Notes: A switch was made to GTK+ 2.x. A shortcut for the keypad comma was added for German keyboards. Program startup is now faster.

        •  30 Jul 2003 14:22

          Release Notes: Some keyboard shortcuts were added.

          •  14 Jul 2003 04:34

            Release Notes: Addition/subtraction has been tweaked to have 100.1 - 100 - 0.1 equal to zero rather than to 10e-17 and so on.

            Recent comments

            28 Dec 2001 15:36 michaelgrant

            Your calculator program was the first package I've installed by hand from the source code. It worked! Better than that I get my old HP28 back with a gorgeous GTK skin on it. Thanx.
            Michael Grant

            22 Oct 2001 11:56 kamin005

            Comments are welcome!
            Please post your comments! I would really like to know
            your opinions on how calcoo can be improved. Also, if
            you find any bugs, please report them to <a


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