Free Fortran Compilers

Free Fortran Compilers and Integrated Development Environments (IDEs)

Free Fortran Compilers

Fortran is one of the earliest imperative computer programming languages around. It is often used for scientific and numeric programs. This page lists free Fortran compilers for various operating systems. Note that the different software listed are compliant with different Fortran standards, eg, ANSI Fortran 77, Fortran 95, Fortran 2003, Fortran 2008 and so on, so be sure to get the appropriate one for your purpose. Some of them may also come complete with debuggers, editors and an integrated development environment (IDE).

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Free Fortran Compilers and IDEs

Open Source Watcom / OpenWatcom Fortran Compiler

The Watcom (now OpenWatcom) Fortran 77 compiler is now available free of charge, complete with source code. This compiler, which generates code for Win32, Windows 3.1 (Win16), OS/2, Netware, MSDOS (16 and 32 bit), etc, was a well-known compiler some years back (until Sybase terminated it).

MinGW'S G77 (GNU Fortran)

This system comes with the GNU G77 Fortran compiler (among other things, including a C/C++ compiler), which you can use to generate Win32 executables from F77 code. Like many systems based on the GNU tools, Mingw32 comes with complete with various programming tools, such as a program maintainence program (ie, make), text processing tools (sed, grep), lexical analyser generator (flex), parser generator (bison), etc.

Intel Fortran Compiler for Linux

The Intel Fortran Compiler for Linux is free for personal, non-commercial use. You will need to register (giving not only your email but also your address and telephone number) to ask them for it. (Note: since I obviously cannot keep signing up just to keep this entry up-to-date, I cannot verify that the software is still available at the time you read this. If you find that you are no longer able to get the compiler even after registering, please let me know and I'll remove this item.) It features an optimizing compiler, the Intel Debugger (GUI and command-line), mixed language support (C and Fortran), full compliance with the Fortran 90, 77 and FORTRAN IV (or FORTRAN 66) standards, support for portions of the Fortran 2003 and 2008 standards, multi-threaded application support (OpenMP and auto-parallelization), ability to handle big-endian data files, compatibility with various Linux tools (like make, gdb and Emacs), substantial compatibility with Compaq Visual Fortran, etc. The optimizing compiler supports interprocedural optimization, profile guided optimization, automatic vectorizer, etc.


G95 is an open source Fortran 95 compiler. At the time this was written, most of the ISO Fortran 95 standard has been implemented. Platforms supported include Linux(x86, Intel IA64, AMD x86_64), Windows, Macintosh OS X, FreeBSD, Sparc Solaris and HP-UX.

Gfortran - the GNU Fortran Compiler

gfortran, part of the GNU Compiler Collection, is a free Fortran 95/2003/2008 compiler. Like all things from GNU, it comes with source code. Precompiled binaries (executables) are available for Windows, Linux, Mac OS X, the old Mac OS (PPC), etc.

Salford FTN95 Fortran 95 Compiler

Salford FTN95 is a Fortran 95 compiler that supports Fortran 77, Fortran 90 and Fortran 95. The compiler generates exectuables for Win32 (but Win32 console and GUI applications) and the Microsoft .NET framework. It comes with CHECKMATE, a tool that lets programmers check the correctness of their code at runtime. Also included is Plato 3 (an IDE), full source level debugging, documentation and examples. You may only generate code for your personal use on your home computer, and all executables will display a banner on execution.

DJGPP GNU G77 (Fortran 77) for MSDOS

This is a development system based on the well-known GNU compiler system that includes compilers for Fortran 77, C, C++, Objective C, etc. It generates 32 bit MSDOS executables that is Windows 95 long-filename-aware. It is a very complete system with IDEs, graphics libraries, lexical analyser generators (flex), parser generators (bison), text processing utilities (like grep, sed), a program maintainence utility (ie, make), a DOS extender, and so on. The compiler, utilities and libraries come with source code.

f2j - Fortran to Java Compiler

f2j translates Fortran 77 source code to Java class files. It is distributed under the GNU GPL and runs on Linux, SunOS/Solaris.

F2C - Fortran to C Translator

This is a well-known Fortran to C converter that comes with source code. The site also includes pre-compiled binaries (executables) for MSDOS and Microsoft Windows, although these are by no means the only systems supported - the compiler works on Unix systems like BSD, Linux, etc. You have to compile the compiler yourself on those systems. Libraries containing the runtime support needed (together with the C source code) are also included. You need a C compiler to generate binaries from your Fortran sources.

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Free Fortran Compilers and Interpreters


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