Projects / grpn


GRPN is a RPN calculator for the X Window system built using the GIMP Toolkit (GTK). GRPN works with real numbers, complex numbers, matrices, and complex matrices. Numbers can be displayed in 4 different radix modes, and complex numbers can be displayed in either Cartesian or polar form, in decimal or engineering notation.

Operating Systems

Last announcement

GRPN calculator has moved to GitHub 23 Dec 2012 12:10

GRPN calculator has moved to GitHub. For any further updates please refer to: For your convenience all versions up to 1.3.4 will remain at the former location:

Recent releases

  •  04 Nov 2013 05:29

    Release Notes: This release adds two binary shift operators: left shift: "lshift" (shortcut <<) and right shift: "rshift" (shortcut >>). It also contains some minor bug fixes.

    •  26 Dec 2011 08:09

      Release Notes: GRPN now uses the Pango font library and the Liberation Mono font as default (see screenshot). The default font can be overwritten with the -fn-disp commandline option. Now both keys "," and "." are always treated as decimal separators, whatever the locale is.

      •  13 May 2011 06:24

        Release Notes: A minor bug was fixed. If the decimal separator is set to "," by the locale, then the behavior of the "." button is also changed to ",".

        •  06 May 2011 19:07

          Release Notes: Clipboard support was added, with Ctrl-C. The comma is no longer a separator in complex numbers. It has been replaced by ";" and ">", since it is used as a decimal separator in some locales. Debian sources and binaries are available.

          •  29 Apr 2011 11:36

            Release Notes: Basemode defaults now to "dec", like the original version 1.1.2. A new command line option, -bm, allows you to change the default value for basemode. A GNOME icon was added. A source package and Debian/Ubuntu binaries (.deb) for i386 and amd64 are available. This release is based on a merge of the sources and the Debian patches 1.1.2-3. The 1.2 branch has been abandoned.

            Recent comments

            15 Nov 2009 09:22 getreu

            Version for gtk+-1.2 (tested on ubuntu 08.04-09.04) can be found in


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