Intel® Fortran Compilers

Performance without compromise on Windows*, Linux* and OS X*

  • Broad support for current and previous Fortran standards, plus popular extensions
  • Intel® Math Kernel Library included in suites
  • Optional Rogue Wave* IMSL* Fortran Numerical Library on Windows

Try & Buy Intel® Fortran Compiler in:

Intel® Parallel Studio XE

A complete Fortran development environment for Windows*

  • Works with Microsoft* Visual Studio* 2010, 2012 and 2013
  • Don't have Visual Studio? No problem - a Fortran development environment based on Microsoft Visual Studio 2010 Shell is included - nothing else to buy!
  • Develop, build, debug and run from the familiar Visual Studio IDE, or build and run from the command line - your choice!
  • 32-bit and 64-bit development included - no extra charge!
  • Create traditional console applications or advanced graphical interfaces with QuickWin, OpenGL* and Windows API support
  • COM (Component Object Model) and .NET interoperability provided
  • Build mixed-language applications with C++, Visual Basic*, Microsoft C# and more! (requires Microsoft Visual Studio)
  • Tens of thousands of declarations of routines, types and constants for Windows API, OpenGL, POSIX, dialogs, multi-byte character support and more!

Intel Fortran integration into Microsoft Visual Studio

  1. Fortran project and source files in Visual Studio
  2. Fortran-aware text editor with context-sensitive help, Go To Definition, templates, coloring and more
  3. Debug Fortran code with full access to Fortran types and arrays
  4. Build and debug mixed-language programs in a single Visual Studio solution
  5. Set breakpoints at Fortran source lines, with optional conditions


Broad support for current and previous Fortran standards, plus popular extensions

  • Full language Fortran 95, full Fortran 2003, plus significant Fortran 2008 features
    • Coarrays
    • DO CONCURRENT
    • 31 array dimensions (standard specifies 15)
    • NEWUNIT in OPEN
    • Much more - see release notes for details
  • Also supports FORTRAN IV (FORTRAN-66), FORTRAN 77 and Fortran 90
  • Extensive OpenMP 4.0* support
  • Source compatible with Compaq Visual Fortran* - most projects just need a rebuild

Performance without compromise

  • Industry leading performance on Intel and AMD* processors.  Take a look at the benchmarks below that were run by Polyhedron* for independent confirmation.


Geomean time in seconds - lower is better
As published 3/10/2014 at http://www.polyhedron.com

  • Extensive optimizations for the latest Intel processors, including Intel® Xeon Phi™ coprocessor
  • Take advantage of multicore, manycore and multiprocessor systems with OpenMP, automatic parallelism, DO CONCURRENT, coarrays and Intel Xeon Phi coprocessor support
  • Patented automatic CPU dispatch feature gets you code optimized for the current running processor

Intel® Math Kernel Library

  • Included in Fortran suites that adds advanced math processing
  • Vectorized and threaded for highest performance on all Intel and compatible processors
  • De facto standard APIs for simple code integration
  • Compatible with all C, C++ and Fortran compilers
  • Royalty-free, per developer licensing for low cost deployment
  • Click here for more information.

Rogue Wave* IMSL* 7 Fortran Numerical Library

  • Optional add-on to the suites that include Intel Visual Fortran compiler
  • Superior accuracy and reliability through 40 years of refinement
  • A comprehensive set of 1000+ algorithms
  • Supporting parallel processing architectures since 1990
  • Evolves easily with software and hardware upgrades
  • Click here for more information and pricing

Outstanding support

  • One year of support included with purchase – gives you access to all product updates and new versions released in the support period plus access to Intel® Premier Support
  • Active user forums for help from experienced users and Intel engineers

Works with your familiar development environment

  • Uses gcc tools, including gdb debugger
  • Link compatible with C and C++ from gcc
  • 32-bit and 64-bit compilers included – no extra charge!

Broad support for current and previous Fortran standards, plus popular extensions

  • Full language Fortran 95, Full Fortran 2003, plus significant Fortran 2008 features
    • Coarrays
    • DO CONCURRENT
    • 31 array dimensions (standard specifies 15)
    • NEWUNIT in OPEN
    • BLOCK
    • Much more - see release notes for details
  • Also supports FORTRAN IV (FORTRAN-66), FORTRAN 77 and Fortran 90
  • Extensive OpenMP 4.0* support

Performance without compromise

  • Industry leading performance on Intel and AMD processors. Take a look at the benchmarks below that were run by Polyhedron for independent confirmation.


Geomean time in seconds - lower is better
As published 3/10/2014 at http://www.polyhedron.com

  • Extensive optimizations for the latest Intel processors including Intel® Xeon Phi™ coprocessor
  • Take advantage of multicore, manycore and multiprocessor systems with OpenMP, automatic parallelism, DO CONCURRENT, coarrays and Intel Xeon Phi coprocessor support
  • Patented automatic CPU dispatch feature gets you code optimized for the current running processor

Intel® Math Kernel Library

  • Included in Fortran suites that adds advanced math processing
  • Vectorized and threaded for highest performance on all Intel and compatible processors
  • De facto standard APIs for simple code integration
  • Compatible with all C, C++ and Fortran compilers
  • Royalty-free, per developer licensing for low cost deployment
  • Click here for more information

Outstanding support

  • One year of support included with purchase – gives you access to all product updates and new versions released in the support period plus access to Intel® Premier Support
  • Active user forums for help from experienced users and Intel engineers

Works with your familiar development environment

  • Build from command line or use Xcode integration (limited feature)
  • Link compatible with C and C++ from gcc
  • 32-bit and 64-bit compilers included – no extra charge!

Broad support for current and previous Fortran standards, plus popular extensions

  • Full language Fortran 95, full Fortran 2003, plus significant Fortran 2008 features
    • DO CONCURRENT
    • 31 array dimensions (standard specifies 15)
    • NEWUNIT in OPEN
    • BLOCK
    • Much more - see release notes for details
  • Also supports FORTRAN IV (FORTRAN-66), FORTRAN 77 and Fortran 90
  • Extensive OpenMP 4.0* support

Performance without compromise

  • Industry leading performance
  • Extensive optimizations for the latest Intel processors
  • Take advantage of multicore, manycore and multiprocessor systems with OpenMP, automatic parallelism, DO CONCURRENT
  • Patented automatic CPU dispatch feature gets you code optimized for the current running processor

Intel® Math Kernel Library

  • Vectorized and threaded for highest performance on all Intel and compatible processors
  • De facto standard APIs for simple code integration
  • Compatible with all C, C++ and Fortran compilers
  • Royalty-free, per developer licensing for low cost deployment
  • Included in Intel® Fortran Composer XE
  • Click here for more information

Outstanding support

  • One year of support included with purchase – gives you access to all product updates and new versions released in the support period plus access to Intel® Premier Support
  • Active user forums for help from experienced users and Intel engineers

Videos to help you get started.

  • Introduction to Intel® Visual Fortran in the Microsoft* Visual Studio* Development Environment
  • Optimizing your application with Intel® C++ and Fortran Compilers for Windows* and Linux*

Register for future Webinars


Previously recorded Webinars:

  • Update Now: What’s New in Intel® Compilers and Libraries
  • An Introduction to Intel® Visual Fortran Development on Intel® Xeon Phi™ coprocessor
  • OpenMP 4.0 for SIMD and Affinity Features with Intel® Xeon® Processors and Intel® Xeon Phi™ Coprocessor
  • Learn to be an Intel® Visual Fortran Power User
  • Optimizing and Compilation for Intel® Xeon Phi™ Coprocessor

More Tech Articles

Intel® Parallel Studio XE 2015 Composer Edition on Linux*
By adminPosted 04/14/20150
Product tour with videos and samples Learn when and how to use the Intel Parallel Studio XE components in a typical software development workflow. You can apply the principles learned to your own application: Identify the performance hotspots in your application Leverage performance libraries ...
What are PEEL and REMAINDER loops? (Fortran and C vectorization support)
By Martyn Corden (Intel)Posted 10/28/20140
The vectorization component of the optimization report produced by the Intel® Compiler version 15 may contain remarks such as: <Peeled> remark #15301: PEEL LOOP WAS VECTORIZED <Remainder> remark #15301: REMAINDER LOOP WAS VECTORIZED The compiler does its best to create an effi...
Diagnostic 15319: Using NOVECTOR directive
By Devorah H. (Intel)Posted 10/02/20140
Product Version: Intel(R) Visual Fortran Compiler XE 15.0.0.070  Cause: When using NOVECTOR directive in code, the vectorization report generated using Visual Fortran Compiler's optimization and vectorization report options ( -O2 -Qopt-report:2) includes non-vectorized loop instance.  Example:...
Diagnostic 15304: non-vectorizable loop instance
By Devorah H. (Intel)Posted 10/02/20140
Product Version: Intel(R) Visual Fortran Compiler XE 15.0.0.070   Cause: The vectorization report generated using Visual Fortran Compiler's optimization and vectorization report options (-Qvec-report2 -O2) includes non-vectorized loop instance when using the following compiler option (Win OS): ...
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Supplemental Documentation

Intel® MKL Sparse BLAS Overview
By Naveen Gv (Intel)Posted 06/25/20120
Sparse BLAS routines can be useful to implement iterative methods for solving large sparse systems of equations or eigenvalue problems
Intel Guide for Developing Multithreaded Applications
By adminPosted 01/16/201224
The Intel® Guide for Developing Multithreaded Applications covers topics ranging from general advice applicable to any multithreading method to usage guidelines for Intel® software products to API-specific issues.
Subscribe to Intel Developer Zone Articles

You can reply to any of the forum topics below by clicking on the title. Please do not include private information such as your email address or product serial number in your posts. If you need to share private information with an Intel employee, they can start a private thread for you.

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Intel Parallel Studio XE 2016 Beta has Started!
By Steve Lionel (Intel)4
The beta test for Intel Parallel Studio XE 2016, including Intel Fortran Compiler XE 16.0, has begun. For more details, a FAQ and a registration link, see Intel® Parallel Studio XE 2016 Beta Major Fortran features supported in this release are: Submodules from Fortran 2008 IMPURE ELEMENTAL from Fortran 2008 "Further Interoperability with C" features from TS29113 (Fortran 2015 draft) For more details see the release notes. Please use Intel Premier Support for any problems you encounter, rather than this forum. If you have questions about Fortran language features, you can ask them in this forum. Please note that the compiler in the initial beta version was built a couple of weeks ago and doesn't include all of the fixes you may have seen described as "fixed in a release later this year". The remainder of this post will be kept updated on "things you should know" about the beta. The current beta includes VS2010 Shell. A beta update will include VS2013 Shell instead. VS2010 Shell wi...
Simple F90 syntax question , if you please
By TommyCee3
Hello, It's been a while since I posted. I have this line: write(13,153) ((( ALOG(WSratio(I,J,K))/ALOG(ZU/ZL), I=1,7), J=1,4), K = 3)Upon compile, IVF v.14.x says this: error #5082: Syntax error, found ')' when expecting one of: , It's almost acting as thought my parentheses are unbalanced, but I believe they are balanced. I wonder what the real violation is here. Any help is appreciated, as always.
Installation Help
By John J.2
Hello, I have access to Microsoft Visual Studio Professional 2013 with Update 4. I want to integrate the Intel Fortran Compiler and MKL with VS on Windows 7. So, what I think I need to do is this: 1) Install VS Professional 2013 2) Install Intel Paralell Studio XE 2015 Composer Edition Is this correct? Is there a better option? Is there somewhere I can read more about my options and/or detailed instructions for integrating these two products?   Thanks in advance
XE 2015 update 4 install on Vista?
By davidspurr4
  Apologies if this has been covered before but it is a while (ex 2013) since I updated my compiler.  Email for latest update came a day or so ago and I figured it was about time I updated from XE2013 (has mostly been working fine, but have been encountering some issues of late). Anyway, at the very start of the install process I get the following message: This machine uses operating system "Windows (TM) Vista Business". Compatibility problems are possible. Installation can continue; however, product functionality may not meet expectations because this product is untested on this operating system. Suggestion: Check Release Notes for a list of supported operating systems and install this product on a compliant system. Can anyone advise if installing XE 2015 on a Vista PC is likely to cause issues using the compiler?  Any warnings or recommendations (apart from 'upgrade Windows'!)? Despite all the tales of woe and other negative comments, personally I have had very few issues wit...
Thread safe Fortran
By Ida Norderhaug D.1
I'm working on making an existing fortran library thread safe. I do this by setting copiler options: /recursive, /reentrancy:threaded, /threads and /Qauto, and by not writing to global variables. I am also in the process of removing data-initialized variables, as these seem to implicitly declared as SAVE. Anything else I need to think about?
error LNK2019 fatal error LNK1120
By Mahesh K.3
I used CALL SYSTEM("dir") it gives these error messages. Please give me help. I'm using visual Studio and Fortran Compiler 11. error LNK2019: unresolved external symbol _SYSTEM@8 referenced in function _RESIST fatal error LNK1120: 1 unresolved externals Thank you.
Edit source while running in Debug mode
By Tony_the_D3
I am running VS 2013 V 12.0.21005.1 and 2015 Composer Fortran for Windows (Package 2015.0.108).  I just installed in on a new computer and moved a solution and related projects and source from an existing older computer.  On the old computer, I am able to Edit source code while running a program.  I usually continue editing (while running in debug) until the line numbers get "lost", then I restart the program and continue.  On the new computer, all files are locked as soon as I start running in debug mode and I cannot edit even at a break point or by using break all.  I have checked file access settings etc and also the Edit and Continue settings and related debug settings and all appear similar between the two computers. So any ideas on how to enable me to edit source code while running in debug mode?
Installing older compiler versions
By Ida Norderhaug D.2
I need to install an older version of the fortran compiler to do some debugging. I can only find the compiler bundeled with a lot of other stuff. Is there a way to install just the compiler? If not, will installing an older version of some package create problems with my existing installation?
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You can reply to any of the forum topics below by clicking on the title. Please do not include private information such as your email address or product serial number in your posts. If you need to share private information with an Intel employee, they can start a private thread for you.

New topic    Search within this forum     Subscribe to this forum


Intel Parallel Studio XE 2016 Beta has Started!
By Steve Lionel (Intel)4
The beta test for Intel Parallel Studio XE 2016, including Intel Fortran Compiler XE 16.0, has begun. For more details, a FAQ and a registration link, see Intel® Parallel Studio XE 2016 Beta Major Fortran features supported in this release are: Submodules from Fortran 2008 IMPURE ELEMENTAL from Fortran 2008 "Further Interoperability with C" features from TS29113 (Fortran 2015 draft) For more details see the release notes. Please use Intel Premier Support for any problems you encounter, rather than this forum. If you have questions about Fortran language features, you can ask them in this forum. Please note that the compiler in the initial beta version was built a couple of weeks ago and doesn't include all of the fixes you may have seen described as "fixed in a release later this year". The remainder of this post will be kept updated on "things you should know" about the beta.
OS X 10.9 Xcode 5 error ld: library not found for -lcrt1.10.6.o
By Ronald W Green (Intel)0
Environment:  OS X 10.9 (Mavericks) and Xcode 5.0 Command line compilations/links fail with "ld: library not found for -lcrt1.10.6.o" Affected compiler:  Intel Composer XE 2013 Update 1 Root cause:  Xcode 5.0 installation does not install all command line tools (include files, libraries, SDKs) need for the compiler to link user applications.  FIX: Install the Xcode 5.0 "Command Line Tools".  Follow this Knowledge Base article for installation of this package:  http://software.intel.com/en-us/articles/installing-intel-compilers-for-os-x-pre-requisite-xcode-command-line-tools
Compiler Installation and Uninstallation Help, Linux and Mac OS
By Ronald W Green (Intel)7
  Installing the Intel compilers on Linux* and Mac OS* X requires that you install various prerequisite packages. Linux: Read this Help on Installing the Intel Compilers. Mac OS X: Read this article on Xcode and Command Line tools installation (prerequisite for installation and use) We also have an article on Linux Silent or Non-Interactive Installation Here And Mac OS X Silent or Non-Interactive Installation Here Having trouble REMOVING or UNINSTALLING the Intel Linux compilers?  Read this article: http://software.intel.com/en-us/articles/uninstall-intel-compiler-for-linux-when-uninstallsh-is-missing-or-not-functioning NOTE: ARTICLES such as this are not monitored on a regular basis - do NOT ask questions here, your quesiton may go unnoticed.  Please post all questions to the USER FORUM
ld: cannot find -lm
By Ronald W Green (Intel)1
RHEL 6.x, FC14, FC13, FC12, SL6.x, CentOS 6, etc. and possibly other recent distributions: error when using -static or -fast: ld: cannot find -lm See this article: http://software.intel.com/en-us/articles/error-ld-cannot-find-lm/
performance degradation with ifort 15.0.2
By Wentao Z.4
Hi, Previously I built my program with ifort 14.0.1 + impi 4.1. Recently, after switching to ifort 15.0.2 + impi 5.0, my program runs ~30% slower on one SandyBridge core. I keep the compiler options the same: -O2 -xHost -openmp. Anyone observed similar things? Any suggestions?  Thanks! Best regards,    Wentao  
Performance of derived type function call
By Patrice l.3
Hi, In the following simple code, where the operator .lt. is used a lot of times, i found that ifort is slower than gfortran by a factor of 2. First i thought it was the handling of the class(*) but in this version there is no class(*) , then i suspected a slow select type, but it just appears that accessing the component from the original class is the problem. what are your thoughts on this ?   gfortran -O3 -fno-inline-functions tata.f90 T b1 extends btype to intb F T T T F time operator .lt. 0.40333300000000000 time selecttype .lt. 0.31666599999999995 time .lt. intb 0.31000000000000016 time .lt. btype 7.3333999999999788E-002ifort -O3 -fno-inline-functions tata.f90 T b1 extends btype to intb T T T T F time operator .lt. 0.723333000000000 time selecttype .lt. 0.670000000000000 time .lt. intb 0.670000000000000 time .lt. btype 0.110000000000000module tata implicit none type :: b_type integer,allocatable :: b c...
error #5462: Global name too long with ifort 15.0.2
By Andrew Porter1
Hello, I'm attempting to compile some Fortran code with ifort 15.0.2. The compilation fails with: algorithm/psy_dynamo_algorithm_rk_timestep_mod.f90(1): error #5462: Global name too long, shortened from: psy_dynamo_algorithm_rk_timestep_mod_mp_invoke_3_compute_mass_matrix_kernel_w2_type_$BLK.var$3033 to: sy_dynamo_algorithm_rk_timestep_mod_mp_invoke_3_compute_mass_matrix_kernel_w2_type_$BLK.var$3033 I found this thread which appears to indicate this problem was fixed back in version 12: https://software.intel.com/en-us/forums/topic/286764 Has it re-appeared and is there some flag/workaround for it? Thanks, Andy.
Messing with POINTERS and ALLOCATABLE dimensions
By holysword0
I'm working with this code which basically allocates and deals with arrays of multiple kinds and dimensions, e.g.   SUBROUTINE calc_real_2(u) REAL, ALLOCATABLE, INTENT(INOUT) DIMENSION(nx,ny) :: u . . . SUBROUTINE calc_real_3(u) REAL, ALLOCATABLE, INTENT(INOUT), DIMENSION(nx,ny,nz) :: u . . . SUBROUTINE calc_cmplx_3(u) COMPLEX, ALLOCATABLE, INTENT(INOUT), DIMENSION(nx,ny,nz) :: u . . .They are all provided in an interface which gathers them all into one "calc" function. The user is supposed to pass u and the rest is decided by the types involved. Since I have to deal with reals integers and complex numbers, ranging from 2 to 7 dimensions, I'd have an ridiculously large number of functions doing basically the same thing. You know, one of those situations you wish you had C's templates. I'm wondering if it is possible to simplify this. I could, of course, have one function for each type looking like SUBROUTINE calc_real(u) REAL, ALLOCATABLE, INTENT(INOUT), DIMENSION(nx*n...
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