LAMMPS Documentation

16 Jul 2018 version

Version info:

The LAMMPS “version” is the date when it was released, such as 1 May 2010. LAMMPS is updated continuously. Whenever we fix a bug or add a feature, we release it immediately, and post a notice on this page of the WWW site. Every 2-4 months one of the incremental releases is subjected to more thorough testing and labeled as a stable version.

Each dated copy of LAMMPS contains all the features and bug-fixes up to and including that version date. The version date is printed to the screen and logfile every time you run LAMMPS. It is also in the file src/version.h and in the LAMMPS directory name created when you unpack a tarball, and at the top of the first page of the manual (this page).

  • If you browse the HTML doc pages on the LAMMPS WWW site, they always describe the most current development version of LAMMPS.
  • If you browse the HTML doc pages included in your tarball, they describe the version you have.
  • The PDF file on the WWW site or in the tarball is updated about once per month. This is because it is large, and we don’t want it to be part of every patch.
  • There is also a Developer.pdf file in the doc directory, which describes the internal structure and algorithms of LAMMPS.

LAMMPS stands for Large-scale Atomic/Molecular Massively Parallel Simulator.

LAMMPS is a classical molecular dynamics simulation code designed to run efficiently on parallel computers. It was developed at Sandia National Laboratories, a US Department of Energy facility, with funding from the DOE. It is an open-source code, distributed freely under the terms of the GNU Public License (GPL).

The current core group of LAMMPS developers is at Sandia National Labs and Temple University:

  • Steve Plimpton, sjplimp at
  • Aidan Thompson, athomps at
  • Stan Moore, stamoor at
  • Axel Kohlmeyer, akohlmey at

Past core developers include Paul Crozier, Ray Shan and Mark Stevens, all at Sandia. The LAMMPS home page at has more information about the code and its uses. Interaction with external LAMMPS developers, bug reports and feature requests are mainly coordinated through the LAMMPS project on GitHub. The domain, currently hosting public continuous integration testing and precompiled Linux RPM and Windows installer packages is located at Temple University and managed by Richard Berger, richard.berger at

The LAMMPS documentation is organized into the following sections. If you find errors or omissions in this manual or have suggestions for useful information to add, please send an email to the developers so we can improve the LAMMPS documentation.

Once you are familiar with LAMMPS, you may want to bookmark this page at Section_commands.html#comm since it gives quick access to documentation for all LAMMPS commands.

PDF file of the entire manual, generated by htmldoc

User Documentation

Indices and tables