Qalculate
A powerful cross-platform desktop calculator library and CLI with symbolic math, unit conversion, arbitrary precision, and plotting.
What is Qalculate?
libqalculate is the core library and command-line interface (CLI) for Qalculate!, a multi-purpose desktop calculator. It provides advanced mathematical capabilities like symbolic computation, unit conversion, arbitrary precision, and plotting, all through a simple yet powerful interface. It solves the problem of needing separate tools for basic arithmetic, scientific calculations, and unit conversions by integrating them into one cohesive system.
Students, engineers, scientists, and anyone needing a powerful calculator for everyday or advanced mathematical tasks, from unit conversions to symbolic algebra and data plotting.
Developers choose libqalculate for its unique combination of ease of use and advanced features, offering a comprehensive mathematical toolkit without the complexity of specialized software like MATLAB or Mathematica, all in an open-source, cross-platform package.
Overview
Qalculate! library and CLI
Use Cases
Best For
- Performing symbolic algebra and calculus calculations
- Converting between units and currencies in scientific or engineering work
- Handling calculations with arbitrary precision and uncertainty propagation
- Plotting mathematical functions or data sets quickly
- Solving equations and inequalities symbolically or numerically
- Everyday calculations with mixed units, percentages, and time/date operations
Not Ideal For
- Real-time embedded systems requiring lightweight, dependency-free numerical computation
- Web applications needing a browser-based calculator without server-side processing
- Projects demanding extensive statistical modeling or machine learning capabilities beyond basic functions
- Teams seeking a drag-and-drop GUI builder with no command-line configuration
Pros & Cons
Pros
Supports factorization, differentiation, integration, and equation solving, as shown in the algebra and calculus examples, rivaling specialized software.
Includes over 400 units with automatic conversion and daily-updated currency rates, enabling expressions like '20 miles / 2 h to km/h' for practical use.
Features rational and floating-point numbers with arbitrary precision, uncertainty propagation, and interval arithmetic for high-accuracy calculations, demonstrated in uncertainty examples.
Fault-tolerant parsing with verbose error messages allows natural input, such as mixing units and functions without strict syntax, as highlighted in the general features.
Offers more than 400 built-in functions across trigonometry, statistics, finance, and calculus, making it versatile for diverse mathematical tasks.
Cons
Requires multiple external libraries like GMP, MPFR, and libxml2, with optional dependencies like Gnuplot for plotting, complicating installation on some systems.
The library is primarily accessed via command-line interface (qalc), which may be less intuitive for users accustomed to graphical calculators without installing separate GUI apps.
Plotting relies on an external Gnuplot dependency, adding setup steps and potential compatibility issues, unlike self-contained solutions.
As a C++ library, integrating it into other languages (e.g., Python, JavaScript) requires bindings or subprocess calls, lacking straightforward cross-language support.
Frequently Asked Questions
Found a gem we're missing?
Open-Awesome is built by the community, for the community. Submit a project, suggest an awesome list, or help improve the catalog on GitHub.