Extcalc – scientific graphic calculator

Extcalc is a scientific graphic calculator released under an open source license.

Extcalc is able to process difficult mathematical functions, to draw graph and to work with them. All standard mathematical operations can be calculated using its attractive graphical frontend, together with more advanced mathematics including calculus.

The software can draw different types of 2D and 3D graphics with OpenGL acceleration.

Extcalc also provides an integrated C-like script programming language.

There is also a console version developed by the developer called Concalc. It is the parser-algorithm of extcalc packed into a simple console program.

Features include:

  • User interface for calculator.
  • User interface for graphics.
  • Mathematical parser with scientific functions:
    • standard functions (+, -, *, /, …);
    • trigonometric functions;
    • logarithms;
    • roots;
    • exponential functions;
    • variables;
    • integration;
    • differential calculation.
  • Drawing of graphs:
    • normal graphs;
    • polar graphs;
    • parameter function graphs;
    • 3D-graphs;
    • dynamic graphs;
    • complex graphs
  • Function graph analysis:
    • calculate x-value;
    • calculate roots;
    • Newton’s Method;
    • calculate y-values;
    • calculate points of intersection;
    • integration;
    • differential calculation.
  • Base-n calculatons.
  • Logic functions.
  • Tables.
  • Script editor.
  • Script management.
  • Script console.
  • Scripting commands:
    • for and while loop;
    • if expression;
    • arrays;
    • break, continue, stop keywords;
    • output functions: print, setcursor, clear;
    • input functions: getkey, getline, keystate;
    • script commands for file usage;
    • 3D-graphics interface for scripting;
    • 2D-graphics interface for scripting.
  • Script debugging messages.
  • Zooming and moving graphics window.
  • Saving screenshots of graphics window.
  • Drawing into graphics window.
  • Complex numbers.
  • Matrix calculations.
  • Vector calculations.
  • Matrix and vector operation support:
    • matrix and vector calculator
    • solving linear equations;
    • analyse matrices and vectors;
    • generate matrices and vectors.
  • Statistic functions:
    • approximation functions;
    • interpolation functions;
    • statistical analysis functions.

Support: Documentation, Examples, SourceForge Project Page
Developer: Rainer Strobel
License: GNU GPL v2


Extcalc is written in C++. Learn C++ with our recommended free books and free tutorials.

Return to Calculators: Graphical Tools</a

Popular series
Free and Open Source SoftwareThe largest compilation of the best free and open source software in the universe. Each article is supplied with a legendary ratings chart helping you to make informed decisions.
ReviewsHundreds of in-depth reviews offering our unbiased and expert opinion on software. We offer helpful and impartial information.
Alternatives to Proprietary SoftwareReplace proprietary software with open source alternatives: Google, Microsoft, Apple, Adobe, IBM, Autodesk, Oracle, Atlassian, Corel, Cisco, Intuit, and SAS.
GamesAwesome Free Linux Games Tools showcases a series of tools that making gaming on Linux a more pleasurable experience. This is a new series.
Artificial intelligence iconMachine Learning explores practical applications of machine learning and deep learning from a Linux perspective. We've written reviews of more than 40 self-hosted apps. All are free and open source.
Guide to LinuxNew to Linux? Read our Linux for Starters series. We start right at the basics and teach you everything you need to know to get started with Linux.
Alternatives to popular CLI tools showcases essential tools that are modern replacements for core Linux utilities.
System ToolsEssential Linux system tools focuses on small, indispensable utilities, useful for system administrators as well as regular users.
ProductivityLinux utilities to maximise your productivity. Small, indispensable tools, useful for anyone running a Linux machine.
AudioSurveys popular streaming services from a Linux perspective: Amazon Music Unlimited, Myuzi, Spotify, Deezer, Tidal.
Saving Money with LinuxSaving Money with Linux looks at how you can reduce your energy bills running Linux.
Home ComputersHome computers became commonplace in the 1980s. Emulate home computers including the Commodore 64, Amiga, Atari ST, ZX81, Amstrad CPC, and ZX Spectrum.
Now and ThenNow and Then examines how promising open source software fared over the years. It can be a bumpy ride.
Linux at HomeLinux at Home looks at a range of home activities where Linux can play its part, making the most of our time at home, keeping active and engaged.
Linux CandyLinux Candy reveals the lighter side of Linux. Have some fun and escape from the daily drudgery.
DockerGetting Started with Docker helps you master Docker, a set of platform as a service products that delivers software in packages called containers.
Android AppsBest Free Android Apps. We showcase free Android apps that are definitely worth downloading. There's a strict eligibility criteria for inclusion in this series.
Programming BooksThese best free books accelerate your learning of every programming language. Learn a new language today!
Programming TutorialsThese free tutorials offer the perfect tonic to our free programming books series.
Linux Around The WorldLinux Around The World showcases usergroups that are relevant to Linux enthusiasts. Great ways to meet up with fellow enthusiasts.
Stars and StripesStars and Stripes is an occasional series looking at the impact of Linux in the USA.
Notify of

This site uses Akismet to reduce spam. Learn how your comment data is processed.

1 Comment
Newest Most Voted
Inline Feedbacks
View all comments
11 months ago

KAlg and Genius for 32 bit