First, a quick tip: you won’t find many "Fortran 77-only" compilers today. Instead, modern compilers like are "backwards compatible." This means they can compile .f or .for files (F77) just as easily as modern F2018 code. 1. GNU Fortran (gFortran) via MinGW-w64
The most popular free, open-source solution for Windows 10 is . To get it, the easiest route is through the MinGW-w64 project, which brings GCC (GNU Compiler Collection) to Windows. How to download and install:
Click , find the Path variable under "System variables," and click Edit . Add the path to your bin folder (e.g., C:\mingw64\bin ). Verify: Open Command Prompt and type gfortran --version . 2. Simply Fortran (The Easy "User-Friendly" Choice) fortran 77 compiler for windows 10 64-bit free download
Even if your Windows is 64-bit, a 32-bit compiler will still work. However, if you are handling massive datasets, ensure you download the x86_64 version of MinGW.
While might seem like a relic from the era of punch cards, it remains a cornerstone of scientific computing and engineering. If you are working with legacy code on a modern Windows 10 64-bit system, you don’t need to hunt for an ancient computer; you just need the right modern tools to run it. The Reality of Modern Fortran Compilers First, a quick tip: you won’t find many
They offer a free Personal Edition which displays a small banner when you run your programs, but otherwise provides a full-featured F77/F90/F5 compiler for 64-bit Windows.
Search for "Edit the system environment variables" in your Windows search bar. GNU Fortran (gFortran) via MinGW-w64 The most popular
Go to the MinGW-w64 website or use a distribution like winlibs.com , which provides standalone "zip" versions that don't require an installer.
Visit the Silverfrost website to download the "FTN95: Fortran for Windows" package. 4. Intel® oneAPI IoT Toolkit (High Performance)