Qalculate

Qalculate is a powerful cross-platform calculator that handles far more than basic arithmetic. Whether you need to solve complex mathematical expressions, convert between units, perform symbolic calculations, or work with advanced functions, this tool delivers professional-grade computation in an accessible interface.

The calculator excels at symbolic mathematics, allowing you to factorize expressions, differentiate and integrate functions, and solve equations with customizable assumptions. It supports over 400 flexible functions spanning trigonometry, statistics, finance, combinatorics, and calculus. With arbitrary precision arithmetic, you get both exact and approximate results—displaying answers like 4 × √2 alongside decimal approximations.

Unit handling is comprehensive, featuring 400+ units with automatic conversion. Convert between imperial, metric, SI, and atomic units seamlessly. Currency conversion updates daily, and the calculator intelligently handles compound units (like converting horsepower from force and velocity).

Key capabilities include:

• Complex numbers, infinite values, and uncertainty propagation
• Matrix and vector operations
• RPN mode for reverse Polish notation
• Plotting functions and data with Gnuplot
• CSV import/export for variables and constants
• Fundamental physical constants with 2022 CODATA values
• Support for multiple number bases, fractions, and roman numerals

Available as a command-line tool (qalc) for quick calculations or interactive mode with history and completion, plus GTK+ and Qt graphical interfaces. The library integrates into other applications including KDE Plasma, Cantor, and mobile platforms.