• All common operators — arithmetic, logical, bitwise, element-wise, (in)equalities
• Expressions may contain any combination of numbers, constants, functions, units, variables, matrices, vectors, and time/dates
• Fault-tolerant and flexible input parsing with verbose error/warning messages
• Calculate as you type
• Arbitrary precision with both rational and floating point numbers
• Complex and infinite numbers
• Propagation of uncertainty and interval arithmetic
• Both exact and approximate output (sqrt(32) = 4 × sqrt(2) ≈ 5.657)
• Simple and mixed fractions: 4 / 6 × 2 = 1.333… = 4/3 = 1 + 1/3
• All common number bases, as well as negative and non-integer radices, roman numerals, etc.
• RPN mode
• Highly customizable with a myriad of options for every aspect of the calculator

• Factorization and simplification
• Differentiation and integration
• Can solve most equations and inequalities
• Customizable assumptions (e.g. ln(2x) where x > 0 = ln(2) + ln(x))

• Over 400 flexible and diverse functions (trigonometry, exponents and logarithms, combinatorics, geometry, calculus, statistics, finance, time and date, etc.)
• Easily created and edited from the user interfaces, with support for different argument types, subfunctions, and custom conditions

• Over 400 diverse units and all standard decimal and binary prefixes
• Includes all SI units, as well as imperial, CGS, atomic, and natural units, and more…
• Automatic and explicit conversion (e.g. ft + yd + m = 2.2192 m, 5 kg × m/s^2 = 5 N, 5 m/s to mph = 11.18 mph)
• Currency conversion with daily updated exchange rates
• Easily created and edited from the user interfaces

• All common basic constants (pi, e, etc.)
• All fundamental physical constants with 2022 CODATA values (including standard uncertainty and optional units)
• CSV file import and export
• Easily created and edited from the user interfaces (including by using simple assignment expressions, e.g. x = 2 s)
• Data sets with objects and associated properties (a data set with chemical elements is included)

• Uses Gnuplot
• Can plot functions or data (matrices and vectors)
• Can be customized using several options, and saved as an image

• Graphical user interfaces implemented using GTK and Qt
• Flexible expression entry with customizable completion, function hints, and continuous display of parsed expression
• Calculate as you type
• History list with support for comments, protection of individual items, search, and use of mathematical operations on previous results
• Customizable keypad with access to most features
• Context-dependent menu for conversion to suitable units and output formats
• Extensive menus with access to all functions, units, and variables, as well as most settings
• Everything but the expression entry can be hidden to minimize footprint and distractions (GTK version)
• Customizable meta modes (GTK) and workspaces (Qt) for quickly switching between different settings
• Dialogs for management of and easy access to functions, variables and units (with quick conversion)
• Dialogs for easy entry of all functions
• Create/edit functions, variables, matrices/vectors, units, and data sets
• Tools for quick conversion between number bases, floating point conversion, calendar conversion, and percentage calculation
• Convenient interface for plots and graphs
• Configurable keyboard shortcuts

…and more…

For more details about the syntax, and available functions, units, and variables, please consult the manual (https://qalculate.github.io/manual/) The manual includes a complete list of included functions, units, and variables, and some examples.