NAG Fortran Compiler Documentation
Fortran Builder


The help system within Fortran Builder provides full documentation. The help system not only gives general advice but will also suggest the right compiler options for your scenario. It also includes an extensive Fortran language guide.

  • Windows help (fortranbuilder.chm, see the security note and installation instructions, below.)

Due to security restrictions on help files, it is not possible to browse the Help file directly from the internet, however if you save the file locally (choose save rather than open if prompted by your browser) to a Microsoft Windows system, opening the help file for the NAG Fortran Builder from the local file system should open the file in Windows help. You will need to unblock help files copied from the internet before the first use. Select the local copy of the file using the right button. Select the properties tab and click the “unblock” button.


The NAG Fortran Builder projects include Console Application, Static Library, Dynamic Library/DLL and projects using various numerical libraries. Once the desired project type has been selected and named, files can be added to the project. Existing Fortran source files can be added to the project using the usual OS file opening dialogue. These files can be edited using the built-in Fortran-aware editor, which can also be used to create new files. The editor uses colour coding of syntax elements to make the source code more readable and features keyword completion.

Fortran Builder screenshots are available here.