Kalk is a calculator developed by KDE with an interface designed to work on both desktop and mobile devices. It uses the Kirigami framework to adapt its layout to different screen sizes and input methods.
The application concentrates on common calculation tasks while providing additional capabilities for unit conversions, currency calculations and binary arithmetic. Its responsive interface makes it suitable for use on a desktop computer or a smaller touchscreen device.
Kalk includes a calculation history that allows previous operations and results to be reviewed. This is useful when performing several related calculations, particularly where an earlier result needs to be checked.
Unit conversion provides an alternative to using a separate conversion tool for everyday measurements. Currency conversion is also integrated into the application, allowing users to switch between calculation and conversion tasks without leaving the interface.
Kalk originated as a fork of Liri Calculator but has since developed into an independent application with its own codebase.
This is free and open source software.
Key Features
- Basic arithmetic calculations.
- Calculation history for reviewing previous results.
- Unit conversion between supported measurement units.
- Currency conversion.
- Binary calculation functionality.
- Responsive interface adapts to desktop and mobile screen sizes.
- Kirigami-based interface with layouts suited to touch and pointer input.
Website: invent.kde.org/utilities/kalk
Support:
Developer: Han Young and KDE contributors
License: GNU General Public License v3.0

Kalk is written in C++. Learn C++ with our recommended free books and free tutorials.
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