You're looking for a Fortran 77 compiler for Windows 10 64-bit that you can download for free. Here are a few options:
: 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 fortran 77 compiler for windows 10 64-bit free download
For quick tests, web-based compilers like replit.com or Compiler Explorer support gfortran with -std=legacy. Not suitable for large projects. You're looking for a Fortran 77 compiler for