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Finite Element Method Magnetics

A Windows finite element solver for 2D and axisymmetric magnetic, electrostatic, heat flow, and current flow problems with graphical pre- and post-processors.

Distribution (ReadMe)

The program comes with no warranty or support. However, there is an independent FEMM user's group at and many frequently asked questions are addressed in the FAQ.

Mathematica 10 support: see note below.

New Build

There is a new build New Build page. The New Build version may contain additional features and bug fixes but has not yet been extensively tested.

Old Versions

Old versions of FEMM, Bela, and Mirage are also still available on the OldVersions page.

Related Tools

The FEMM 4.2 distribution includes toolboxes for interacting with FEMM from Octave/Matlab, Scilab, and Mathematica.


For Matlab, add the mfiles directory with the interactive pathtool command.


Recommended distributions of Gnu Octave that run on Windows are:

FEMM needs the Octave-Forge "Windows" package to efficiently communicate with Octave. In recent versions of Octave, Octave-Forge must manually be select during install:

Select OctaveForge during the install of Octave

After installation, you'll need to add FEMM's mfiles directory to Octave's search path:

Add FEMM mfiles directory to Octave search path


Scilab can be obtained from The SciFEMM interface is automatically included in every installation. 64-bit FEMM requires 64-bit Scilab for the the two programs to successfully communicate (and 32-bit FEMM requires 32-bit Scilab).


The MathFEMM interface to Mathematica has been tested on Mathematica 4.2, 7, and 9, though it may work on other versions. The package works with either the 32 or 64 bit versions of Mathematica. Mathematica must be installed prior to FEMM installation. Otherwise, FEMM will not prompt for the installation of Mathematica support during installation.

Mathematica 10: (11Dec2014) As of Mathematica 10, the Mathematica installation no longer automatically puts copies of the Mathlink DLLs (ml64i2.dll, ml64i3.dll, ml64i4.dll for 64-bit or ml32i2dll, ml32i2.dll, ml32i4.dll for a 32-bit installation) into the Windows system32 folder. For new installs of FEMM with Mathematica 10, the FEMM installer won't be able to tell that Mathematica is installed and won't offer the option of installing with Mathematica support. For existing installations of FEMM with Mathematica support, FEMM won't be able to see the Mathlink DLLs, and the program won't run correctly. These problems can be fixed by copying the Mathlink DLLs from the Mathematica installation (in the C:\Program Files\Wolfram Research\Mathematica\10.0 tree) to either c:\windows\system32 (allowing new installations to install and run) or to c:\femm42\bin (allowing an existing installation to run).


FEMM is licensed under the terms of the Aladdin Free Public License. The Triangle mesh generator and the Lua scripting language, which are included in the distribution, each have their own licensing terms.

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