GNU Fortran (MinGW-W64) 13.2.0 Copyright (C) 2023 Free Software Foundation, Inc. If you see an error, restart your terminal or check your PATH. Create a file named hello.f (note the .f extension, which signals fixed-form F77) with this classic code:
If you are a scientist, engineer, or student trying to revive, maintain, or learn from legacy Fortran 77 code on a system, you face a unique challenge: Microsoft no longer bundles a compiler, and many older compilers (like Lahey or Watcom) are incompatible with modern 64-bit environments. fortran 77 compiler for windows 10 64-bit free download
If this works, your Fortran 77 compiler is fully operational. The myth that you cannot run Fortran 77 on modern Windows 10 64-bit is just that—a myth. Whether you choose GFortran via MinGW-w64 (best overall), Silverfrost FTN77 (easiest for pure legacy code), or WSL (for Unix purists), you have multiple free download options. GNU Fortran (MinGW-W64) 13
Download MinGW-w64 + GFortran as described in Part 3. It gives you a native 64-bit compiler, active updates, and full Fortran 77 compatibility with the -std=f77 flag. You will be compiling legacy code within 15 minutes. If this works, your Fortran 77 compiler is fully operational
gfortran --version You should see something like:
gfortran -static -std=f77 -o myprogram.exe mycode.f This embeds all runtime libraries into the EXE. GFortran recognizes .f as fixed-form, .f90 as free-form. If your file is named oldcode.for , simply rename it or use:
Create bisect.f :