SpeedCrunch is a high-precision scientific calculator. It features a syntax-highlighted scrollable display and is designed to be fully used via keyboard. Some distinctive features are auto-completion of functions and variables, a formula book, and quick insertion of constants from various fields of knowledge. It is available for Windows, OS X, and Linux in a number of languages.



To build SpeedCrunch, you need:

  • A C++11-capable compiler (e.g. Microsoft Visual C++ 2013 or later, GCC 4.8 or later)
  • Qt 5.2 or later
  • CMake 2.8.12 or later

To build SpeedCrunch in a dedicated build directory and install it, run the following commands from the root of the source directory:

mkdir build
cd build
cmake ../src
make install

When building against a Qt version that is not the system default Qt installation, point CMake towards the Qt installation to use by setting the CMAKE_PREFIX_PATH environment variable to the prefix directory of the Qt installation when running CMake.

You can customize the build using the following variables. These are specified when running CMake, in the form cmake ../src -Dvariable=value.

  • PORTABLE_SPEEDCRUNCH: Set this to on to have the application settings stored in the same location as the executable, e.g. for running from a USB drive without requiring installation.
  • CMAKE_INSTALL_PREFIX: Change the installation prefix for SpeedCrunch.
  • REBUILD_MANUAL: Set to on to also rebuild the included manual. By default, a bundled prebuilt copy is used to minimize dependencies. Rebuilding the manual requires the following additional software:



This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.