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Fortran 77 Compiler For Windows 10 64-bit Free Download

Best for: Users who also need Unix tools, make, autotools.

Steps:

Now gfortran works in Command Prompt or PowerShell.

  • Verify installation: Open Command Prompt (or PowerShell) and type: fortran 77 compiler for windows 10 64-bit free download

    gfortran --version

    You should see output like GNU Fortran (x86_64-posix-seh-rev0) 8.1.0.

    • Fortran 77 requires fixed formatting. Use -ffixed-form and -fno-blank-lines flags. Better yet, convert tabs to spaces using a text editor like Notepad++.

  • Multi-file:
  • With debugging and linking LAPACK:

    • Best for: Beginners, classroom use, simple GUI. Best for: Users who also need Unix tools, make, autotools

    What is it?
    Silverfrost FTN77 is a free Fortran 77 compiler for Windows. It’s no longer actively updated, but it’s lightweight, includes an IDE (Plato), and works on Windows 10 64-bit.

    Download & Install Steps:

  • Install

  • Run

    • Note: This is a 32-bit compiler, but it runs fine on Windows 10 64-bit.