Fortran 77 Compiler For Windows 10 64-bit Free Download [updated] Jun 2026

The world of FORTRAN 77 is a fascinating bridge between the era of punch cards and modern supercomputing. While the original "g77" compiler is largely a relic of the past, you can still run and compile classic Fortran 77 code on Windows 10 (64-bit) using modern, free tools that are backward compatible. The Top Choice: GFortran (via MSYS2 or MinGW) The most reliable way to compile Fortran 77 today is using , which is part of the GNU Compiler Collection (GCC) . It is fully compatible with the legacy F77 standard while offering the stability of a modern 64-bit application. : This is widely considered the best environment for Windows. It provides a package manager ( ) that lets you install the latest GFortran binaries easily. How to install : Download the installer from the MSYS2 website , open the "MSYS2 MinGW 64-bit" terminal, and run: pacman -S mingw-w64-x86_64-gcc-fortran : A standalone version of the GCC tools for Windows. You can download pre-packaged versions like the which are "portable" (no installation required) and include GFortran. The Professional Choice: Intel® Fortran Compiler Intel now offers its high-performance Fortran Compiler as part of the Intel oneAPI HPC Toolkit Why use it? It is legendary for its optimization on Intel processors and includes full support for legacy Fortran 77. Requirement : You typically need to have Microsoft Visual Studio Community (also free) installed first to use it as an integrated development environment (IDE). The "Legacy" Feel: Silverfrost FTN95 If you are looking for a tool specifically designed for Windows with a "Personal Edition" that is free for home use, Silverfrost FTN95 is a popular choice. Highlights : It includes a specialized IDE (Plato) and is one of the few modern compilers that still feels like a classic Windows development tool while supporting the F77 standard. Comparison of Free Options Compatibility General use, open-source fans Excellent (F77, F90, F95+) Intel Fortran High-performance / scientific math Professional Grade Silverfrost FTN95 Beginners on Windows Specifically built for Win10/11 Open Watcom Retro-computing enthusiasts Strong F77 focus A Quick Technical Note When writing or compiling Fortran 77, remember the "Column 7" rule . Unlike modern languages, classic F77 expects actual code to begin in column 7, with columns 1-5 reserved for labels and column 6 for "continuation" markers. If your code isn't compiling, check your indentation! step-by-step guide on how to compile your first "Hello World" file using one of these tools? Installation of GFortran in Windows 10 - Yutaka Masuda

You're looking for a Fortran 77 compiler for Windows 10 64-bit that you can download for free. Here are a few options:

GNU Fortran (gfortran) : The GNU Fortran compiler is a popular, widely-used, and free compiler that supports Fortran 77. You can download the 64-bit version for Windows 10 from the official GNU website:

https://gcc.gnu.org/fortran/download.html Specifically, you can download the latest version of gfortran for Windows from the MinGW-w64 project: fortran 77 compiler for windows 10 64-bit free download

https://sourceforge.net/projects/mingw-w64/files/

Follow the installation instructions to install gfortran on your Windows 10 system.

Silverfrost FTN95 : This is a free Fortran 95 compiler that also supports Fortran 77. It comes with a comprehensive development environment, including a code editor, debugger, and project manager. The world of FORTRAN 77 is a fascinating

https://www.silverfrost.com/ftn95.html You can download the free Community Edition, which is suitable for non-commercial use.

Intel Fortran Compiler (ifort) : Although not a traditional Fortran 77 compiler, the Intel Fortran Compiler supports Fortran 77 and is available for free on Windows 10 64-bit.

https://software.intel.com/content/www/us/en/develop/tools/oneapi/components/fortran-compiler.html You'll need to create an Intel Developer Zone account to access the free download. It is fully compatible with the legacy F77

Open64 : This is another free, open-source Fortran compiler that supports Fortran 77.

https://open64.net/ You can download the Windows 64-bit version from the Open64 website.