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

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  • 1
    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: 16 This Week
    Last Update:
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  • 2
    Financial Calculator

    Financial Calculator

    Windows 11 only — includes 16 sections with text and visual reports.

    Take control of your finances with Financial Calculator 8.0, a professional yet easy-to-use desktop tool built for precise, everyday financial calculations. From planning loans and estimating taxes to generating invoices and creating QR codes, this all-in-one software offers 16 specialized sections that make your daily financial and business tasks faster, clearer, and more accurate. Whether you’re a student, small business owner, or finance professional, Financial Calculator brings professional-grade precision to your desktop—no installation required. Perform calculations for Bank, Barcode, Building, Buy & Sell, Commodity, Dividing Money, Inflation, Interest, Internet Usage, Invoice, Loan, Password, Phone, QR Code, Stock Market, and Tax.
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    Downloads: 27 This Week
    Last Update:
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  • 3
    A simple calculator programmed in python 3.1.2
    Downloads: 10 This Week
    Last Update:
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  • 4

    Function Calculator

    Calculate some BASIC mathematical function

    Calculate some BASIC mathematical function You can browse the source at: https://github.com/TheNiceGuy/FunctionCalculator
    Downloads: 7 This Week
    Last Update:
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  • 5
    Code for a Public Domain Calculator based on xml flowcharts
    Downloads: 6 This Week
    Last Update:
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  • 6
    Time Calculator

    Time Calculator

    Calculator GUI+CLI, but for time intervals

    Does simple math of two time values in the format MM:DD:YY. This allows adding/subtracting one duration with another without having to do any extra math to convert to/from decimal.
    Downloads: 3 This Week
    Last Update:
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  • 7
    A tool for Spellcrafters and their customers playing Mythic Entertainment's MMPORG, Dark Age of Camelot
    Downloads: 5 This Week
    Last Update:
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  • 8
    Allows you to determine a new coumadin or warfarin regimen based on a previous coumadin regimen and INR. Should help develop anticoagulation regimens
    Downloads: 3 This Week
    Last Update:
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  • 9
    A python pygtk based calculator designed to be very simple and very modular. This program will aim to let the user add functionality with ease. This program will have functionality such as a history and variable assignment.
    Downloads: 3 This Week
    Last Update:
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  • 10
    rpCalc is a simple RPN (Reverse Polish Notation) calculator.
    Downloads: 3 This Week
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  • 11

    Beerans Calculator Suite

    All-in-one calculator for everyone!

    A free, fully offline calculator suite available as both a **Progressive Web App** and a **Windows desktop app** — **55 calculators across 8 categories**, no ads, no subscriptions, no account required. PWA — Install as an App Beeran's Calculator Suite is a **Progressive Web App** — install it from your browser with no App Store required. ### Android (Chrome) 1. Open Chrome and go to **[beeranscalculatorsuite.com](https://beeranscalculatorsuite.com)** 2. Tap the **⋮ menu** → **"Add to Home screen"** 3. Tap **"Add"** — the icon appears on your home screen ### iOS (Safari) 1. Open Safari and go to **[beeranscalculatorsuite.com](https://beeranscalculatorsuite.com)** 2. Tap the **Share button** (box with arrow) at the bottom 3. Tap **"Add to Home Screen"** → **"Add"** > PWA installation on iOS requires Safari. Chrome on iOS does not support "Add to Home Screen" for PWAs.
    Downloads: 2 This Week
    Last Update:
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  • 12
    Black Spot Leaf Area Calculator

    Black Spot Leaf Area Calculator

    Automated leaf area estimation from scanned leaf images

    Black Spot is a free stand alone software and method to estimate leaf area from images of leaves captured using standard flatbed scanners. This easy to use software allows the user to batch process a large number of samples from multiple species with minimal user input.
    Downloads: 2 This Week
    Last Update:
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  • 13
    Calendar Calc v2.0

    Calendar Calc v2.0

    Date utilities for any calendar task

    CalendarCalc represents a significant leap forward in digital time management and chronological calculation tools, offering a refined and powerful user experience directly on your Windows desktop. Designed to bridge the gaps left by traditional calendar applications, this utility focuses specifically on the mathematics of time, allowing you to instantly solve any query related to durations, intervals, and international holiday occurrences. With an advanced calculation engine and a fluid cross-platform interface, the app enables you to determine with surgical precision the exact number of years, months, weeks, and days between any two dates, eliminating the risk of human error in manual calculations. Beyond calculating time differences, the app features a versatile date projection function that allows you to add or subtract specific time periods to immediately identify future deadlines or past events, an indispensable tool for project management, legal term calculations, or retireme
    Downloads: 2 This Week
    Last Update:
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  • 14
    Forex Assistant

    Forex Assistant

    Manage accounts, analyze trades, track strategies & stats , News & Cal

    Forex Assistant is a comprehensive Windows desktop application designed to support forex traders in every aspect of their trading journey. From essential trading calculators and market insights to powerful account and trade management, it brings everything you need into one intuitive platform. 🔑 Main Features 🧮 Calculator Tools Profit/Loss Calculator Currency Converter Position Size Calculator Pips Calculator Margin Calculator 🌍 Market Insights Live Market News Economic Calendar 📊 Account Manager Add multiple trading accounts with balance and custom descriptions. Track current balance, profit/loss, and drawdown (daily and total). Add and manage positions manually with full details: entry price, stop loss, take profit, volume, PNL, and notes. Add notes for every trade: describe the strategy used, whether the trade was emotional or technical. Import historical trades directly from MetaTrader HTML reports. 📈 Trade Analysis & Insights
    Downloads: 2 This Week
    Last Update:
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  • 15
    A program to calculate the amount of goods you must send from a production factory to a consumer in order to avoid exceed the maximum production. This is mainly an iniciative to make the simutrans team to incorporate in the game a helper tool like th
    Downloads: 2 This Week
    Last Update:
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  • 16
    a transmission line impedance calculator
    Downloads: 2 This Week
    Last Update:
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  • 17
    It's a simple calculator program in python.
    Downloads: 2 This Week
    Last Update:
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  • 18
    pyscaline

    pyscaline

    A simple calculator written in Python 3.3.0 and GTK+

    Downloads: 2 This Week
    Last Update:
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  • 19
    Money Math

    Money Math

    Smart financial calculator for savings, discounts and payments

    Looking for a simple yet powerful financial tool? Our calculator app helps you easily manage your money with four key features. You can calculate how much your savings will grow with interest — just enter your deposit, rate, and period. It’s perfect for planning your investments. The app also helps you understand discounts — input the original price and discount percentage, and see the final price instantly. Managing regular payments is simple: just enter the amount, frequency, and duration to find out your total expenses. Additionally, the app provides a clear financial overview, combining all calculations to help you plan smarter. Its intuitive interface makes navigation easy, and all calculations use reliable formulas for precision. The app is fast, lightweight, and works offline, securing your privacy by not storing personal data. Whether budgeting, saving, or shopping smarter, this app is your go-to tool for better financial decisions.
    Downloads: 1 This Week
    Last Update:
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  • 20
    Financial Calculator (Linux)

    Financial Calculator (Linux)

    Professional financial tools: 16 sections with text and visual reports

    Take control of your finances with Financial Calculator 8.0, a professional yet easy-to-use desktop tool built for precise, everyday financial calculations. From planning loans and estimating taxes to generating invoices and creating QR codes, this all-in-one software offers 16 specialized sections that make your daily financial and business tasks faster, clearer, and more accurate. Whether you’re a student, small business owner, or finance professional, Financial Calculator brings professional-grade precision to your desktop—no installation required. Perform calculations for Bank, Barcode, Building, Buy & Sell, Commodity, Dividing Money, Inflation, Interest, Internet Usage, Invoice, Loan, Password, Phone, QR Code, Stock Market, and Tax.
    Downloads: 1 This Week
    Last Update:
    See Project
  • 21
    NZMATH

    NZMATH

    Python Calculator on Number Theory, three-birds-one learning material

    NZMATH is a Python calculator on number theory. It is freely available and distributed under the BSD license. All programs are written only by Python so that you can easily see their algorithmic number theory. You can get NZMATH with a single command: % python -m pip install -U nzmath Here % is the command line prompt of Windows or Unix/macOS. This release contains several program corrections and additions obtained by writing a programming "notebook" of the book 'Lectures on Elementary Number Theory' (TAKAGI, Teiji) in Python-NZMATH language. The "notebook" is available together. It is designed for beginning students of algorithmic number theory to self-study Number Theory, Programming and scientific English together, three-birds-one learning material. It is possible only by running and reading the programs. You can get the notebook here: https://sourceforge.net/projects/nzmath/files/nzmath-enttakagi/ Visit our home page in detail: https://nzmath.sourceforge.io/
    Downloads: 1 This Week
    Last Update:
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  • 22
    PraktiCalc

    PraktiCalc

    a practical calculator written in Python

    PraktiCalc is an unique calculator with many features you see elsewhere, and some you only get here. Development is happening on GitHub at the time of writing. If you have any issues or feature ideas, please let me know by opening an issue on GitHub (you can also open a ticket here if you want, but I don't look at them that often). There are packages for Windows (x86_64), macOS (aarch64) and Linux (Debian, AppImages for amd64/aarch64, TinyCore).
    Downloads: 1 This Week
    Last Update:
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  • 23
    Python Advanced Scientific Calculator

    Python Advanced Scientific Calculator

    Really, it is the title. By an 11 year old kid...

    What this is, is an ongoing indie project for making a calculator. Well, it has more functions then your average calculator... Simple as that. There is no readme yet, but in the program, type features. Sorry, can't figure out formatting...
    Downloads: 1 This Week
    Last Update:
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  • 24
    Python Calculator

    Python Calculator

    My own project

    Made like in one day, using PyQT5, QT Designer, and PyInstaller
    Downloads: 1 This Week
    Last Update:
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  • 25
    REPCAL (REverse Polish CALculator) is a light and fast calculator in RPN (reverse polish notation) mode for the console (command line). It is written in 180 lines of Python code, and can be used both interactively or inside shell scripts.
    Downloads: 1 This Week
    Last Update:
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