Browse free open source C++ Calculators and projects below. Use the toggles on the left to filter open source C++ Calculators by OS, license, language, programming language, and project status.

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  • 1
    PeaZip

    PeaZip

    Free Zip software and Rar extractor

    PeaZip is a free archiver tool. The application provides an unified, natively portable, cross-platform file manager and archive manager GUI for many Open Source technologies like 7-Zip, FreeArc, PAQ, UPX. Create: 7Z, ARC, Brotl, BZip, GZip, PEA, TAR, WIM, XZ, ZPAQ, ZIP, Zstandard files and more Open and extract 200+ file types: ACE, CAB, DEB, ISO, RAR, ZIPX and more Features of PeaZip includes extract, create and convert multiple archives at once, create self-extracting archives (sfx), split files, strong encryption with two factor authentication, encrypted password manager, secure deletion, find duplicate files, calculate hashes, export task definition as command line script.
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    Downloads: 1,340 This Week
    Last Update:
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  • 2
    Windows Calculator

    Windows Calculator

    A simple yet powerful calculator that ships with Windows

    Calculator is the open source version of the Microsoft Windows Calculator application. It is a modern Windows app written in C++ and C#, offering standard, scientific, and programmer modes, unit/currency conversion, date calculations, and history/memory operations. It ships preinstalled with Windows and is actively developed on GitHub. Standard Calculator functionality, which offers basic operations and evaluates commands immediately as they are entered. Scientific Calculator functionality, which offers expanded operations and evaluates commands using the order of operations. Programmer Calculator functionality, which offers common mathematical operations for developers, including conversion between common bases.
    Downloads: 116 This Week
    Last Update:
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  • 3
    Integrated Development Environment for some microcontrollers based on 8051(e.g. AT89S8253). Supported languages are Assembly and C. It has its own simulator, assembler, editor and many other tools. See the project web site for more details and the newest updates.
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    Downloads: 351 This Week
    Last Update:
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  • 4
    Advanced Trigonometry Calculator

    Advanced Trigonometry Calculator

    Open-source C/C++ math engine for advanced scientific computing

    Advanced Trigonometry Calculator (ATC) is an open-source mathematical computing engine written mainly in C/C++. Created in 2011 and maintained by Renato Alexandre dos Santos Freitas, ATC is designed as a practical Windows desktop application for advanced calculations, automation, and technical problem solving. ATC supports equation solving, polynomial tools, complex numbers, matrix calculations, statistics, physics, geometry, unit conversions, DSP/FFT operations, and scripting. It can also process batch TXT files, making it useful for repeatable calculations and automated workflows. The project also includes ATC Online Alpha, a WebAssembly-based version that brings parts of the ATC engine to the web. ATC is released under the GPLv3 license and is made in Portugal.
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    Downloads: 139 This Week
    Last Update:
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  • 5
    CEmu emulator

    CEmu emulator

    Third-party TI-84 Plus CE / TI-83 Premium CE emulator

    Developer-oriented emulator of the eZ80-based TI-84 Plus CE / TI-83 Premium CE calculators. CEmu is a third-party TI-84 Plus CE / TI-83 Premium CE calculator emulator, focused on developer features. The core is programmed in C and the GUI in C++ with Qt, for performance and portability reasons. CEmu works natively on Windows, macOS, and Linux! Easy setup - get running by doing a one-time-only connection of your calculator! Accurate and fast emulation. Customizable speed/throttling. Resizable calculator screen. "Always-on-top" window option. Screen capture (PNG). Screen recording (animated PNG). File sending/receiving (not for Apps/OS yet). Multiple keybinding presets. Emulation states for efficient saving / restoring. Color skins (like the real devices). Available in English, French, Spanish, and Dutch.
    Downloads: 8 This Week
    Last Update:
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  • 6
    Precise Calculator
    Precise Calculator has arbitrary precision and can calculate with complex numbers, fractions, vectors and matrices. Has more than 150 mathematical functions and statistical functions and is programmable (if, goto, print, return, for).
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    Downloads: 31 This Week
    Last Update:
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  • 7
    TTCalc - a mathematical calculator
    TTCalc is an open source bignum mathematical calculator. It features arithmetical functions, trigonometric functions, inverse trigonometric functions, hyperbolic functions, inverse hyperbolic functions, logical operators, logarithms and so on.
    Downloads: 15 This Week
    Last Update:
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  • 8
    Qalculate! is a multi-purpose desktop calculator for GNU/Linux (now ported to Mac via MacPorts). It is small and simple to use but with much power and versatility underneath. Features include customizable functions, units, arbitrary precision, plotting, and a user-friendly interface (GTK+). Qalculate! has now moved to GitHub (https://github.com/Qalculate). Get the latest version from http://qalculate.github.io/downloads.html.
    Downloads: 7 This Week
    Last Update:
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  • 9
    GraphCalc is a very gui graphing calculator. It has been called a good replacement for a TI-85. It is a must for any high school math student.
    Downloads: 8 This Week
    Last Update:
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  • 10
    ReHash is an easy-to-use console-based hash calculation tool written in C++. It supports many algorithms and output formats and it can be fully configured using some of the many command-line arguments which can be passed to the tool.
    Downloads: 11 This Week
    Last Update:
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  • 11
    Simple Calculator

    Simple Calculator

    A simple calculator.

    This is a simple calculator written in C++ with the Qt framework, without any extra features. A program for minimalists.
    Downloads: 14 This Week
    Last Update:
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  • 12
    fHash

    fHash

    A files hash calculator for Windows and macOS.

    An open source files hash calculator for Windows and macOS. * MD5, SHA1, SHA256 and SHA512. * Drag & drop. * Integrated with context menu in Explorer/Finder. * Support Windows 7 and later. * Support macOS 13 and later, with universal binary. * Support Dark Mode. * English and Simplified Chinese UI. The icon "希" is from hash in Chinese "哈希".
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    Downloads: 6 This Week
    Last Update:
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  • 13
    OptionMatrix

    OptionMatrix

    Financial Derivatives Calculator with 171+ Models (Options Calculator)

    A real-time financial derivatives calculator supporting 171+ models from QuantLib, Financial Numerical Recipes in C++ and MetaOptions. Matrices of prices are created with iterating strikes and/or months. A strike control system can produce any strike. A generalized date engine can calculate re-occuring distances to any industry used expiration into the future. Spread engine with spread views. Models Supported: Black-Scholes, Merton-73, Black-76, Roll Geske Whaley, Garman KohlHagen, Jump Diffusion, Quanto, Vasicek Bond Option, Turnbull Wakeman Asian, TimeSwitchOption, Look Barrier, Bachelier, PartialTimeBarrier, GapOption, Extreme Spread Option, Simple Chooser, ComplexChooser, PartialFixedLB, Executive, CashOrNothing, Extendible Writer, OptionsOnOptions, BAWAmericanApprox, BSAmericanApprox, AssetOrNothing, Bisection, BAWbisection, BSbisection, Gfrench, Gcarry, Swapoption, Complex Chooser, Super Share, EquityLinkedFXO, Spread Approximation, BinaryBarrier and more
    Downloads: 2 This Week
    Last Update:
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  • 14
    Once upon a time there was a pocket calculator called the HP15C. It used a system called Reverse Polish Notation (RPN) for doing its calculations. The Fairwood Calculator is a RPN calculator designed for the computer.
    Downloads: 2 This Week
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  • 15
    ChemCalc is a calculator that is more oriented towards chemistry. Although starting out as a console app, it is a hope that an X11 interface will be designed at a later time.
    Downloads: 5 This Week
    Last Update:
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  • 16
    3-DPhysicsSim

    3-DPhysicsSim

    3-DPhysicsSim is an interactive 3-D physics simulator.

    3-DPhysicsSim is an interactive 3-D physics simulator which allows you to create a scene filled with objects and see how the objects act in real-time when governed by the laws of physics. 3-DPhysicsSim was created with the help of Irrlicht, WxWidgets and Bullet
    Downloads: 4 This Week
    Last Update:
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  • 17
    Engineering Calculator

    Engineering Calculator

    Engineering Calculator and Unit Converter

    Engineering Calculator is a lightweight, yet handy math expression evaluation and unit conversion utility that is always at your fingertips.
    Downloads: 4 This Week
    Last Update:
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  • 18
    Extcalc is a multifunctional scientific graphic calculator for linux with features like graph drawing, graph analysis and calculating scientific functions including differentiation, integration and logic functions.
    Downloads: 4 This Week
    Last Update:
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  • 19
    It began as a small C++ calculations program then became a Visual Basic calculator and is now C++ once more.
    Downloads: 4 This Week
    Last Update:
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  • 20
    CalcEm was the emulator that started it all. It was the first emulator for Texas Instruments calculators with public source code. CalcEm is capable of emulating Texas Instruments calculator models 82 and 83.
    Downloads: 3 This Week
    Last Update:
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  • 21
    pfcalc is a pipe friction calculator using the Darcy-Weisbach equation. gpfcalc is a Gtk front-end for pfcalc. Qpfcalc is a Qt front-end for pfcalc.
    Downloads: 3 This Week
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  • 22
    Multiple dielectric transmission line calculator using a 2D field solver to compute the transmission line characteristics from the circuit trace dimensions entered by the user.
    Downloads: 1 This Week
    Last Update:
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  • 23

    Grepo-Tool

    Grepolis utility

    Map viewer and planning utility for Grepolis. The program uses freely accessible data to produce maps and allows for strategical planning of game actions. Grepolis itself is a multiplayer online game and is the intellectual property of InnoGames GmbH To install grepotool, please download the ZIP-File and unpack it into a writable directory. In addition, you may need to install OpenSSL (32-Bit version) and copy three DLLs manually into the grepotool/bin directory. Attention: To include the newest server please read the Wiki or Ticket section. You can simply update the containing server.txt file with an text editor like notepad++.
    Downloads: 1 This Week
    Last Update:
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  • 24
    RF Calc
    RF Online attack power calculator
    Downloads: 2 This Week
    Last Update:
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  • 25
    X-Bc (formerly: xbc) is a graphical user interface to the command line calculator bc. All Inputs and Outputs stays visible for editing and comparing. Functionality: trigonometry, number-theory, exponential funcs, scientific constants, primenumbers ...
    Downloads: 2 This Week
    Last Update:
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