Fortran 77 Compiler For Windows 10 64-bit Free Download 【UPDATED →】

If you prefer a native Linux experience inside Windows 10, enable WSL (Windows Subsystem for Linux). Then install gfortran from Ubuntu’s repositories. This gives you a true Fortran 77 environment without dual-booting.

Best for: High performance, easy integration with Visual Studio.
License: Free for students, open-source contributors, and academic use (Intel oneAPI Base Toolkit).
Fortran 77 support: Fully supported, including fixed-form source.

Download source: Intel oneAPI HPC Toolkit. fortran 77 compiler for windows 10 64-bit free download

For easy command-line access:

Open Watcom is a venerable open-source toolchain that includes a Fortran 77 compiler (wfc386). It targets 32-bit protected mode. It is rock-solid for pure F77 code but has limited Windows API integration. If you prefer a native Linux experience inside

Create hello.f:

      PROGRAM HELLO
C     Standard Fortran 77 fixed format
      PRINT *, 'Hello, Fortran 77 on Windows 10 64-bit!'
      STOP
      END

Compile and run:

gfortran -std=legacy -o hello.exe hello.f
./hello.exe

Expected output:

 Hello, Fortran 77 on Windows 10 64-bit!

Have a specific Fortran 77 compiler issue on Windows 10 64-bit? Leave a comment below or search our community forums – thousands of legacy Fortran users face the same challenges daily. Best for : High performance, easy integration with

Despite the age of the Fortran 77 standard, legacy scientific and engineering codes still require maintenance and execution. Modern Windows 10 64-bit operating systems do not natively include a Fortran compiler. This paper explores free, production-quality compiler options that support the Fortran 77 standard, provides step-by-step installation procedures, and verifies functionality with a classic example.