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Qalculate Calculator


Qalculate calculator is a very powerful and easy to use open source desktop calculator.

This utility is small and simple to use but with much power and versatility.

Its features include customizable functions, units, arbitrary precision, plotting and a graphical interface, that uses a one-line fault-tolerant expression entry (although it supports optional traditional buttons).

License: GNU/GPLv2+

It is available in Debians and Kali Linux repository.


  • Graphical user interfaces implemented using KDE or GTK+-2.0 and Glade XML.
  • Flexible expression entry and separate result display.
  • Displays whether result is precise or not.
  • Small and … not so small mode.
  • Practical menus give fast access to all advanced features.
  • Calculation history.
  • Optional traditional calculator buttons.
  • Dialogs for management of and easy access to functions, variables and units (with quick conversion).
  • User friendly dialogs for functions, with description and entries for arguments.
  • Create/edit functions, variables and units.
  • Easy editing of matrices and vectors.
  • Easy interface to gnuplot.
  • Separate window for fast conversion between number bases.
  • Periodic table.
  • Small separate utilities for base, currency and unit conversion.
  • Additional text based interface with full functionality.
  • Enhanced completion.
  • Meta modes.
  • Calculation and parsing

Qalculate calculator.

How to install via a terminal window:

sudo apt-get install qalculate

Press Enter, done.

Developers website


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