KCalc is a calculator for your desktop environment.
In the simple mode it can be used for basic arithmetic operations, but provides advanced modes for scientific, statistical and numeral system calculations.
This is free and open source software.
Key Features
- Trigonometric functions, logic operations and perform statistical calculations.
- A results stack which enables convenient recall of previous calculation results.
- Precision is user-definable.
- The display allows cut and paste of numbers.
- The display colours and font are configurable, aiding usability.
- The use of a wide range of key-bindings make it easy to use without a pointing device.
Website: apps.kde.org/en-gb/kcalc
Support: Documentation, Code Repository
Developer: Evan Teran (maintainer), Klaus Niederkrüger, Bernd Johannes Wuebben and others
License: GNU General Public License v2.0

KCalc is written in C++. Learn C++ with our recommended free books and free tutorials.
Related Software
| Calculators | |
|---|---|
| Qalculate! | Powerful and easy to use multi-purpose desktop calculator |
| Genius | Desktop calculator, an educational tool in mathematics, and for research |
| SpeedCrunch | High precision and powerful desktop calculator |
| KCalc | Scientific calculator designed for KDE |
| Calculator | Simple and easy to use calculator |
| KAlgebra | Replace your graphing calculator |
| rpCalc | Simple RPN calculator |
| Kalk | Cross-platform application built with the Kirigami framework |
| Modular Calculator | Aimed at scientific, engineering or computing work |
| Nonpareil | High-Fidelity calculator simulator |
| Wombat | High-precision scientific calculator |
| Uno Calculator | Port of Windows calculator |
| SwitchCalc | GTK4 calculator |
| Schulrechner | Calculator you know from school |
| Pebbles | GTK-based app |
| Cuneo | Widget-like calculator and conversion tool |
| RCalc | RPN calculator |
| galculator | RPN and algebraic calculator |
| Extcalc | Multifunctional scientific graphic calculator |
| gdcalc | Financial, scientific, statistical and programming calculator |
| Sums | Postfix calculator designed for quick calculations |
| Free42 | HP-42S calculator simulator |
| Yesser Calculator | Extensible calculator |
| xcalc | Simple scientific calculator that can emulate a TI-30 or an HP-10C |
| x48ng | Reboot of the HP 48 emulator |
| tCalc | Simple calculator written in core Tcl/Tk |
| OxiCalc | Small, simple calculator. It uses GTK4. |
| MCalc | Perform simple mathematical operations |
| Eigen | GTK4 matrix calculator |
Read our verdict in the software roundup.
Explore our carefully curated directory of recommended free and open source software, covering every major software category.The directory forms part of our extensive collection of articles for Linux enthusiasts. It includes hundreds of detailed reviews, together with free and open source alternatives to proprietary software from companies such as Google, Microsoft, Apple, Adobe, IBM, Cisco, Oracle, and Autodesk. LinuxLinks also covers interesting projects worth exploring, Linux-compatible hardware, free programming books and tutorials, and much more. Know a useful free and open source Linux application that we haven’t covered? Tell us about it using our submission form. |


Please read our Comment Policy before commenting.
The version reviewed here is the older one. The newer one completely destroyed usability, and is simply terrible to work with.