Qalculate! - the ultimate desktop calculator

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).

Download version 5.6

Latest News

2025-06-30

Qalculate! version 5.6 released

Changes:

Add support for display of repeating decimals using overline (vinculum) instead of ellipsis
Support all real numbers in binomial(), comb(), and perm() functions
Add boolean argument for reversed conversion (to text string) in bin(), oct(), dec(), hex(), and base()
Add support for units in limit()
Improve simplification and speed in diff() function for high orders
Do not allow, or warn about, attempted conversion using "to" in function expression
Show a warning when it appears as if the user tries to convert part of an expression
Show error (and fix status) when trying to perform multiple conversions at same time using "to" command (without preceding expression on the same line)
Improve handling of functions returning text string or value with angle unit, in angle and text arguments
Improve handling of random numbers in iterative functions and in function arguments of custom functions
Disable calculate as you type for expression containing export, load, or command function
Use LANGUAGE environment variable, instead of LANG, on Windows in order to avoid changing regional format settings
Improvements/fixes for currencies and exchange rates
Fix integral with infinite limit with unit
Fix non-localized data set key properties (when translated version is available)
Fix angle conversion for (in)equalities (both sides where converted)
Fix default separator in load() and export() functions
Fix µ_B name/symbol for Bohr magneton
Fix incorrect limit for expression containing tan(x) when value to approach is pi/2 without direction
Add "language" option (CLI)
Reset exact value (for dual approximation) when applying "to" command (CLI)
Fix autocalculate input offset with readline vi mode (CLI)
Fix abort using SIGINT (Ctrl+C) during factor command (CLI)
Add "-" after unit prefix symbol (k and M excluded), in completion list, to indicate that it must be followed by a unit (GTK, Qt)
Use selection (as if button was clicked) if RPN stack is visible when using keyboard shortcut for RPN operation (GTK)
Fix segfault in some cases when creating variable with long title/value (GTK)
Fix empty category field in matrix/vector edit dialog (GTK)
Use tabular numbers (tnum) font feature (fixes alignment with Adwaita font) in history, RPN stack, and for binary numbers in result (GTK)
Fix copy result to clipboard (and inconsequential crash after any action) in Gnome shell search provider (GTK)
Fix calculate-as-you-type not responding to unit modifier changes (Qt)
Traditional Chinese translation
Minor bug fixes and feature enhancements