RPN Calculators for Windows

View 26295 business solutions

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

  • Gemini 3 and 200+ AI Models on One Platform Icon
    Gemini 3 and 200+ AI Models on One Platform

    Access Google's best plus Claude, Llama, and Gemma. Fine-tune and deploy from one console.

    Build generative AI apps with Vertex AI. Switch between models without switching platforms.
    Start Free
  • Catch Bugs Before Your Customers Do Icon
    Catch Bugs Before Your Customers Do

    Real-time error alerts, performance insights, and anomaly detection across your full stack. Free 30-day trial.

    Move from alert to fix before users notice. AppSignal monitors errors, performance bottlenecks, host health, and uptime—all from one dashboard. Instant notifications on deployments, anomaly triggers for memory spikes or error surges, and seamless log management. Works out of the box with Rails, Django, Express, Phoenix, Next.js, and dozens more. Starts at $23/month with no hidden fees.
    Try AppSignal Free
  • 1
    WP 34s

    WP 34s

    Scientific/engineering firmware repurposing HP business calculators!

    This project has created scientific firmware for the HP-20b and HP-30b business calculators. WP 34S turns either of these calculators into a powerful keystroke programmable scientific device. According to our customers, it's the most powerful and fastest RPN scientific pocket calculator ever built. WP 34S is alive and stable since 2011. We have succeeded in satisfying the most picky users - read about their experiences on http://www.hpmuseum.org/forum/forum-8.html. Since 2014, WP 34S runs in version 3.3. Our customers confirm its documentation is excellent and comprehensive (see feedback); a full-color printed edition is available from https://www.amazon.com/dp/153366238X since 2018-10-15. Alternatively, you can get a personalized pdf-manual for a ≥ 9 US$ donation here. We have also produced the WP 31S which is derived from the WP 34S source code. This is an entry-level scientific calculator. Its printed manual is available from https://www.amazon.com/dp/1499231164 .
    Leader badge
    Downloads: 27 This Week
    Last Update:
    See Project
  • 2
    4tH compiler

    4tH compiler

    A Forth compiler with a little difference

    4tH is a Forth compiler with a little difference. Instead of the standard Forth engine it features a conventional compiler. 4tH is a very small compiler that can create bytecode, C-embeddable bytecode, standalone executables, but also works fine as a scripting language. It supports about 95% of the ANS Forth CORE wordset and features conditional compilation, pipes, files, assertions, forward declarations, enumerations, structures, suspended execution, recursion, include files, etc. It comes with an RPN calculator, BASIC interpreter, line editor, preprocessor, compiler, decompiler, C-source generator, a virtual machine, and a multitasking environment.
    Leader badge
    Downloads: 83 This Week
    Last Update:
    See Project
  • 3
    RPNcalculator
    Nice looking calculator using Reverse Polish Notation (RPN) written for Windows. It supports DEC, HEX, BIN, OCT numbers, GRAD, RAD and DEG.
    Leader badge
    Downloads: 13 This Week
    Last Update:
    See Project
  • 4
    Calcoo is a scientific calculator (with both RPN and algebraic modes) designed to provide maximum usability.
    Leader badge
    Downloads: 31 This Week
    Last Update:
    See Project
  • Our Free Plans just got better! | Auth0 Icon
    Our Free Plans just got better! | Auth0

    With up to 25k MAUs and unlimited Okta connections, our Free Plan lets you focus on what you do best—building great apps.

    You asked, we delivered! Auth0 is excited to expand our Free and Paid plans to include more options so you can focus on building, deploying, and scaling applications without having to worry about your security. Auth0 now, thank yourself later.
    Try free now
  • 5
    TRURL

    TRURL

    A suite of RPN calculators and a class library for Object Pascal

    TRURL is a suite of desktop calculators with reverse Polish notation (RPN) written in Object Pascal. Additionally, it comes with a free reusable class library (RPN Engine) as a toolbox for creating your own calculator. TRURL is an acronym for "TRURL is a Reusable Universal RPN Library". Class Libraries: • RPN Engine: Full-featured calculation engine for Pascal-based RPN calculators • Segmitator: Library for virtual seven-segment displays Applications: • TRURL A: Simple demo app for the RPN Engine • TRURL B: RPN calculator in the design of the famous calculators by Dieter Rahms for Braun • TRURL G: Desktop RPN calculator inspired by the UI of the DSKY unit of the Apollo Guidance Computer (AGC)
    Downloads: 13 This Week
    Last Update:
    See Project
  • 6
    OpenDRO
    OpenDRO is an open source project to develop embedded software that runs on digital readouts (DROs) for lathes, mills, and other machine tools.
    Downloads: 6 This Week
    Last Update:
    See Project
  • 7
    RPNCalc

    RPNCalc

    RPNCalc - The command line Reverse Polish Notation (RPN) Calculator

    RPNCalc is the command-line based Reverse Polish Notation (RPN) calculator. RPN calculators make it very simple to do complex calculations, especially if there are parentheses involved. I've created a User Guide (https://frossm.github.io/RPNCalc-UserGuide) to do a better job of explaining how to use RPNCalc than the old readme.md file, which was getting really long. If you have questions, issues, feedback, or ideas, please let me know. You can contact me via the links in the **Introduction** page of the User Guide. ## RPNCalc User Guide: https://frossm.github.io/RPNCalc-UserGuide ##
    Downloads: 10 This Week
    Last Update:
    See Project
  • 8
    WA2L/WinTools

    WA2L/WinTools

    End User Tools for Windows.

    Some end user utilities for the Windows operating system. The utilities can be called thru the "Send To" context menu when right-clicking on a file or directory in the explorer or thru the Windows "Start Menu". The package can be 'installed' portable and does not need admin rights. ◆ 𝗨𝗧𝗜𝗟𝗜𝗧𝗜𝗘𝗦 - https://sourceforge.net/projects/wa2l-wintools/files/ → README ◆ 𝗙𝗘𝗔𝗧𝗨𝗥𝗘𝗦 - https://wa2l-wintools.sourceforge.net/man1/wintools.1.html - https://wa2l-wintools.sourceforge.net/man1/wintoolsintro.1.html ◆ 𝗣𝗔𝗖𝗞𝗔𝗚𝗘 𝗗𝗢𝗖𝗨𝗠𝗘𝗡𝗧𝗔𝗧𝗜𝗢𝗡 - http://wa2l-wintools.sourceforge.net/ ◆ 𝗦𝗘𝗘 𝗔𝗟𝗦𝗢 🚩 - https://sourceforge.net/p/wa2l-wintools/wiki/Home/ ◆ 𝗣𝗔𝗖𝗞𝗔𝗚𝗘 𝗙𝗢𝗥𝗠𝗔𝗧 The package is distributed in the following format: - WA2LWinTools-<VERSION>-<DATE>.exe (self extracting zip file) ◆ 𝗢𝗧𝗛𝗘𝗥 𝗣𝗥𝗢𝗝𝗘𝗖𝗧𝗦 - https://sourceforge.net/projects/wa2l-simplebackup/ - https://sourceforge.net/projects/wa2l-edrc/ .
    Downloads: 5 This Week
    Last Update:
    See Project
  • 9
    This is a Reverse Polish Notation (RPN) Fraction Calculator. It works like any other RPN calculator, except that it operates on fractions instead of decimal numbers. Decimal number entries are not permitted. Whole numbers are permitted.
    Downloads: 2 This Week
    Last Update:
    See Project
  • AI-generated apps that pass security review Icon
    AI-generated apps that pass security review

    Stop waiting on engineering. Build production-ready internal tools with AI—on your company data, in your cloud.

    Retool lets you generate dashboards, admin panels, and workflows directly on your data. Type something like “Build me a revenue dashboard on my Stripe data” and get a working app with security, permissions, and compliance built in from day one. Whether on our cloud or self-hosted, create the internal software your team needs without compromising enterprise standards or control.
    Try Retool free
  • 10
    kalc is a programmable scientific calculator, using RPN (Reverse Polish Notation). Its behaviour imitates a HP48/HP49 calculator. Works with real and complex numbers, unlimited size integers, arbitrary-precision real numbers and more.
    Downloads: 1 This Week
    Last Update:
    See Project
  • 11
    Reor Calculator

    Reor Calculator

    Reor is a winsome calculator with loads of functions, by Ajay Menon.

    Reor is a free calculator which is crafted into perfection with a winsome interface. Reor has got Scientific, Statistical, Graphical and many more types of tools built-into it, while maintaining an attractive interface.
    Downloads: 2 This Week
    Last Update:
    See Project
  • 12
    Baculator is a Reverse Polish Notation (RPN) calculator program with an infinite scrollable stack and support for most common mathematical operations as well as some more esoteric operations. Available for Unix/Gtk+, Mac OS X, and MS Windows.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 13
    BitLogic

    BitLogic

    Simple Java computer algebra calculator

    A calculator that solves many types of problems including solving equations computing derivatives and integrals simplifying expressions graphing equations 2d and 3d reverse polish notation, algebraic and word based interpreter infinite writing board for writing out equations requires java 11 or more
    Downloads: 0 This Week
    Last Update:
    See Project
  • 14

    C_Sharp_Calculator

    RPN based calculator in C#.

    Currently, this is the first version of an RPN calculator made to be easy to implement for any C# project requiring parsing of text into calculable data. Using RPN (Reverse Polish Notation) to place strings in a specific format to allow fast processing for parsing and evaluating the string.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 15
    CoTerminalApps

    CoTerminalApps

    defunct, get SliderPuzzles or RetroArcade, instead

    This collection of ASCII games has been split into a) SliderPuzzles & b) RetroArcade . CoTerminalApps is a collection of ASCII games & puzzles. that can run on Windows, Mac/OSX, & Linux. Includes SpaceInvaders, Pacman & Frogger arcade games and an RPN calculator.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 16
    Differential Calculator

    Differential Calculator

    Terminal calculator with differential error estimates

    This is a terminal calculator with a remarkable twist. It uses symbolic differentiation to provide a numerically precise error estimate with each calculated answer. It mimics the functionality of an HewlettPackard ReversePolishNotation [RPN] calculator simply because I like RPN. But along with your answer, you get some measure of its trustworthiness. Runs on PCs or laptops running Windows or Linux.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 17
    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: 0 This Week
    Last Update:
    See Project
  • 18
    HP25c - BlackBerry Storm RPN Calculator
    This application emulates an HP25c RPN calculator on a BlackBerry Storm/Storm 2. It is 100% compatible with the classic pocket calculator of the late 1970s, is fully programmable, and will include a program librarian to save and recall user programs.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 19

    HPN cli calculator

    A functional HP-style command-line RPN scientific calculator

    HPN is a functional - as opposed to microcode - cross-platform emulation of a classic 1970s Hewlett-Packard scientific calculator for any command-line interface. Its operations completely model the historical and groundbreaking HP-35 series, and functions to support the HP-45 and the later HP-65, 67 and HP-15C are in the pipeline.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 20
    HorsePower is J2ME scientific calculator optimised for use on mobile phones, with the appearance of the classic range of Hewlett Packard calculators. (MIDP 1.0 & CLDC 1.0)
    Downloads: 0 This Week
    Last Update:
    See Project
  • 21
    IntervalRpnCalculator

    IntervalRpnCalculator

    An HP RPN calculator with interval output

    This terminal app runs on PCs or laptops running OSX or GNU/Linux. It attempts to mimic the functionality of an HP ReversePolishNotation [RPN] calculator with the added enhancement of interval output. So along with your answer, you get a good idea of its trustworthiness. This app uses GAOL, a C++ library to perform arithmetic with floating-point intervals.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 22
    Java-Calculator

    Java-Calculator

    I believe it is the best tool for everone get it it's free.

    Scientific Calculator includes the following features: * Traditional algebraic or RPN operation * Result history * Math Functions * Percentages * Binary, octal, and hexadecimal conversion * Large input/output display I believe it is the best tool for everone get it it's free.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 23
    An RPN calculator in Java with a minimalistic interface, designed to be stylish, complete and useful.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 24
    Occay! RPN Desktop Calculator
    A slim desktop calculator using RPN for easy, fast, and accurate computations. Suited for engineers and scientists. Knows a lot of numbers ;) Written in simple C++ using FLTK. Runs on Linux and Windows.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 25
    An open source RPN calculator written in C
    Downloads: 0 This Week
    Last Update:
    See Project
  • Previous
  • You're on page 1
  • 2
  • Next
MongoDB Logo MongoDB