FeynCalc is a Mathematica package for symbolic evaluation of Feynman diagrams and algebraic calculations in quantum field theory and elementary particle physics.

You can ask your questions about FeynCalc or participate in the related discussions in our forum powered by GitHub Discussions

The PDF version of the manual can be found here. If you prefer the web version, there is an online manual for the development version and the stable version.

Development of FeynCalc costs a lot of effort and is done on a largely voluntarily basis. To support the developers and increase their academic visibility, please acknowledge our work when you use FeynCalc in your research. You can do so by citing the following FeynCalc papers:

• V. Shtabovenko, R. Mertig and F. Orellana, TTP23-056, P3H-23-089, SI-HEP-2023-27, Comput. Phys. Commun., 306, 109357, 2024, arXiv:1601.01167.

• V. Shtabovenko, R. Mertig and F. Orellana, P3H-20-002, TTP19-020, TUM-EFT 130/19, Comput. Phys. Commun., 256, 107478, 2020, arXiv:2001.04407.

• V. Shtabovenko, R. Mertig and F. Orellana, "New Developments in FeynCalc 9.0", Comput. Phys. Commun., 207, 432--444, 2016, arXiv:1601.01167.

• R. Mertig, M. Böhm, and A. Denner, "Feyn Calc - Computer-algebraic calculation of Feynman amplitudes", Comput. Phys. Commun., 64, 345--359, 1991.

FeynCalc is covered by the GNU General Public License 3.

Copyright (C) 1990-2025 Rolf Mertig

Copyright (C) 1997-2025 Frederik Orellana

Copyright (C) 2014-2025 Vladyslav Shtabovenko

FeynCalc is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

FeynCalc is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with FeynCalc. If not, see http://www.gnu.org/licenses/.