Qalculate!

Qalculate! is an arbitrary precision cross-platform software calculator.^[9] It supports complex mathematical operations and concepts such as derivation, integration, data plotting, and unit conversion. It is a free and open-source software released under GPL v2.

Qalculate!
A screenshot of qalculate-gtk
Original author(s)	Niklas Knutsson,[1][2][3]
Developer(s)	Hanna Knutsson,[4] Sven Herzberg
Initial release	2 August 2003; 21 years ago (2003-08-02) (version 0.1)[5][6][7]
Stable release	5.2.0[8]  / 10 July 2024; 12 months ago (10 July 2024)
Repository	github.com/Qalculate
Written in	C++
Operating system	Linux Windows macOS
Platform	Winget Windows installer Snap Flatpak Standalone executable
Type	Math, calculator
License	GPL
Website	qalculate.github.io

Features

Qalculate! supports common mathematical functions and operations, multiple bases, autocompletion, complex numbers, infinite numbers, arrays and matrices, variables, mathematical and physical constants, user-defined functions, symbolic derivation and integration, solving of equations involving unknowns, uncertainty propagation using interval arithmetic, plotting using Gnuplot, unit and currency conversion and dimensional analysis, and provides a periodic table of elements, as well as several functions for computer science, such as character encoding and bitwise operations.^{[10][11][12][13][14][15][16][17][18]}

It provides four interfaces: two GUIs, one using GTK (qalculate-gtk) and another using Qt (qalculate-qt), a library for use in other programs (libqalculate), and a CLI program for use in a terminal (qalc).

• Qalculate! (GTK+ GUI): qalculate-gtk^[19]
• Qalculate! (Qt GUI): qalculate-qt
• Qalculate! (CLI): qalc (usually provided by the libqalculate package)^[20]
• Qalculate! (Library): libqalculate^[21]

A session with the qalc CLI

Use in academic research

• Bartel, Alexandre. "DOS Software Security: Is there Anyone Left to Patch a 25-year old Vulnerability?."
  • "In our example of Figure 7, we choose to execute /usr/bin/qalculate-gtk, a calculator. Since the stack of the DOSBox process is non-executable, we cannot directly inject our shellcode on it."
  • "The Gnome calculator was used to perform these calculations and the results were verified using the Qalculate! calculator and WolframAlpha (15) since spreadsheets are unable to perform these calculations."

See also

• Mathematical software
• List of open-source software for mathematics
• List of arbitrary-precision arithmetic software
• Comparison of software calculators