Qalculate! is a multi-purpose cross-platform desktop calculator. It is simple to use but provides power and versatility normally reserved for complicated math packages, as well as useful tools for everyday needs (such as currency conversion and percent calculation). Features include a large library of customizable functions, unit calculations and conversion, symbolic calculations (including integrals and equations), arbitrary precision, uncertainty propagation, interval arithmetic, plotting, and a user-friendly interface (Gtk, Qt, and CLI).
Changes:
- Ask for interpretation of comma (when comma is not the default decimal separator)
- Support "to 1/n" as alternative to "to fraction"
- Use icon for "AC" button, and no icon for "DEL" button
- Automatically set "Use comma as decimal separator" and "Ignore comma/dots in numbers" when local digit grouping is selected
- Improvements for insert function dialog in RPN mode
- Add option to place percent/remainder button in number pad
- Do not add conversion to expression when using convert button on calculate-as-you-type result
- Input of only conversion operator (arrow) using middle-click on convert button, or new "Custom" menu option
- Fix segfault when closing application with preferences open
- Fix segfault when removing row or column with defined custom button
- Fix automatic digit grouping in decimals
- Support input of base in log() function before parenthesis, e.g. "log20(400)" (equivalent to "log(400, 20)") (libqalculate)
- Support input of exponent before argument of trigonometric function (e.g. "sin²(x)") (libqalculate)
- Support input of functions with more than one argument using RPN syntax (libqalculate)
- Add new binary prefixes (robi, quebi), and enable use of recently added SI prefixes in output by default (libqalculate)
- Micron unit (libqalculate)
- Data set translation fixes (libqalculate)
- Return exact integers in more case in log() function (libqalculate)
- Fix segfault with text argument containing potential text returning function, or variable containing text value (libqalculate)
- Fix segfault during calculation of (in)equality with root() function with insufficient number of arguments (libqalculate)
- Fix segfault during output of both approximate and exact logical OR value without (in)equality (libqalculate)
- Fix qError() function (libqalculate)
- Minor bug fixes and feature enhancements
Download the source code here:
qalculate-qt-5.7.0.tar.gz
Download the source code of libqalculate here:
libqalculate-5.7.0.tar.gz
Windows binaries (updated 2025-08-06 with clear button fix):
64-bit installer
64-bit zip (unpack and run without further installation; no application data are read or written outside of the unpacked directory)
The binaries can also be installed using the Windows Package Manager (winget). Requires Windows 10 (1809) or later.
GNU/Linux binaries:
A flatpak package (recommended) is available at https://flathub.org/apps/details/io.github.Qalculate.qalculate-qt.
For more information visit the website at http://qalculate.github.io/.