DonateQalculate!
- 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).
Latest News
2026-05-25
Qalculate! version 5.11 released
Changes:
- Add set functions (union, intersect, setdiff, setxor, isMember, isSubset) and operators (∪, ∩, ∖, ⊖, ∈, ⊆, etc.)
- Add characters(), count(), digitSum(), and digitalRoot(), find(), popCount(), string(), and while() functions
- Support negative row and column values in element(), row(), and column() functions
- Support matrix[row][column] syntax
- Support text objects in sort() function
- Add third optional argument to interval() function to allow exclusion of exact endpoints
- Ignore "to" and "where" (and equivalent symbols) inside quotation marks
- Ignore dot in front of plus or minus (for consistent behavior in line with entrywise operators)
- Show "Division by zero" warning for all divisions by zero
- Make display of expressions with time units in time format more consistent
- Fix support for vector in argument of many functions (erf, mod, exp, etc.)
- Fix explicit conversion to mixed units for year variants
- Fix first digit missing in return value of integerDigits() in some cases
- Fix segfault when Calculator object is destroyed with uninitialized random state
- Fix infinite loop when referencing subfunction in another subfunction
- Fix segfault in replace() with variable specified using where expression, e.g. "replace(v, x, 1) where v = x"
- Fix segfault when data set function name is followed immediately by a single dot
- Fix v[i]=a syntax for vector element assignment
- Do not bind escape key (fixes bad behavior with keys that generate escape sequences, e.g function keys) (CLI)
- Fix use of x, y, z, without backslash, for arguments when using function command (CLI)
- Fix parse status and calculate-as-you-type when "where" expression defines a new symbol (Gtk, Qt)
- Convert degree Celsius to Fahrenheit and vice versa in Gnome search provider (Gtk)
- Fix compilation on macOS (Gtk)
- Minor bug fixes and feature enhancements