Qalculate! - the ultimate desktop calculator

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, physical constants, symbolic calculations (including integrals and equations), arbitrary precision, uncertainty propagation, interval arithmetic, plotting, and a user-friendly interface (GTK, Qt, and CLI).
Qalculate! is free software, licensed under the GNU Public License v2 (or later).

This project welcomes new developers. Visit the project page here.

Latest News

.: 2021-07-29 :. Qalculate! version 3.20.1 released

List of changes:

Fix segfault when Gnuplot is not installed (GUI)
Save answer to dot and temperature questions in non-interactive mode and do not show the questions in non-interactive terse mode
Fix saving of sub functions with default values

Get the new version from the downloads page.

.: 2021-07-28 :. Qalculate! version 3.20 released

This version includes a new interface using the Qt GUI toolkit. It is nearly feature complete (notably editing of units and data sets are not currently possible) but is likely not yet completely stable and reliable. At this moment the new user interface is only included in the official binary packages for Windows where the improved speed and compatibility should be particularly welcome.

List of changes:

New graphical user interface using Qt (qalculate-qt)
Updated insert function dialog layout (GUI)
Add description field to variables and units dialogs (GUI)
Add customizable keyboard shortcut for insert result (GUI)
Insert "smart parentheses" with right parenthesis key if expression has selection or text cursor is at start (GUI)
Add language option to configuration file (GUI)
Fix background color of expression entry in inactive window (GUI)
Add translator credits to about dialog (GUI)
Catalan translation
Add support for function creation in save() function and with associated operator (e.g. func1():=x*y^2)
Add operators (.', .*, ./, .^) and functions (replace multiply(), divide(), and pow()) for transpose and element-wise multiplication, division, and power
Fix norm() and magnitude(), and add second argument, p, to norm() function
New text operators: dot, cross, comb, and perm
Add support for ^^ as XOR operator
Fixes and improvements in multisolve() function
Always return exact result in base() function, in exact mode
Improve parsing of functions without parentheses
Do not try to load data objects from global definitions dir if data set is local
Interpret "±" at end of expression as "±0"
Convert Celsius to Fahrenheit if no calculation was performed
Add support for QALCULATE_USER_DIR environment variable and always check for "user" directory on Windows
Output both original and factorized integer, and output abs(x) as |x| (CLI)
Improved HTML output of mathematical expressions in libqalculate (used by the new GUI)
Minor bug fixes and feature improvements

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