Download latest FLUKA release

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User registration is mandatory for downloading FLUKA. Please read the licence conditions and follow these instructions. Registered users can download the packages below (login with your CERN Lightweight account or your regular CERN account).

Previous FLUKA user ids (so-called FUIDs) do not grant access to the FLUKA packages on this website, but a new registration is required.

Once your registration is complete and you received the final confirmation email, it might still take a couple of hours until the registration database is synchronized and you can download the files.

System requirements and installation instructions can be found here. It is recommended to consult this page if you are unsure which package to download.

Latest FLUKA version: 4-2.0, released on:
Release highlights:


  • A novel model for low-energy (<150 MeV/n) deuterons has been included, overcoming a long-standing shortcoming of the code.
  • A deuteron preformation mechanism is now accounted for in hadron-nucleus inelastic interactions.
  • The explicit generation and transport of alpha particles from the decay of radioactive nuclei are now performed.
  • The nuclear reaction cross section of protons has been refined in the near-threshold region for {50,52,53,54}Cr, {54,56,57,58}Fe, {60,61}Ni, {63,65}Co, {92,94,95,96,100}Mo, and 184W.
  • Optical photon generation by local sub-threshold energy deposition events is now accounted for, addressing the behavior reported in this forum post.
  • Further dose-conversion coefficients are now available as per ICRP Publication 116 and ICRU Report 95.


  • Magnetic fields can now be defined via input cards for combinations of analytical (dipole to decapole) and numerical field maps.
  • The SPECSOUR card can now simulate interactions on a target particle at rest.
  • All post-processing tools (bin/us*, bin/gplevbin, and bin/detsuw) now make use of dynamic memory allocation.
  • A new processing tool (usbscw) is available in order to add USRBINs from different study cases with respective weights.

Several bugs were fixed (see release notes of FLUKA 4-2.0 for a complete list).

With this release, the embedded DPMJET package is now aligned with the officially distributed DPMJET-III version 19.2.0.

Binary libraries for GNU/Linux:
Download gfortran 7, 64 bits (.tgz)
Download gfortran 7, 64 bits (.rpm)
Download gfortran 7, 64 bits (.deb)
Download gfortran 9, 64 bits (.tgz)
Download gfortran 9, 64 bits (.rpm)
Download gfortran 9, 64 bits (.deb)
Binary libraries for macOS:
Download gfortran 8, 64 bits (.tgz)
Download gfortran 10, 64 bits (.tgz)
Download gfortran 11, 64 bits - ARM (.tgz)
Source code*:
Download (.tgz)
Download (.rpm)