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The Feynman diagram generator FeynArts and the computer algebra program FormCalc allow for an automatic computation of 2$\rightarrow$2 and 2$\rightarrow$3 scattering processes in High Energy Physics. We have extended this package by four new kinematical routines and adapted one existing routine in order to accomodate also two- and three-body decays of massive particles. This makes it possible to compute automatically two- and three-body particle decay widths and decay energy distributions as well as resonant particle production within the Standard Model and the Minimal Supersymmetric Standard Model at the tree- and loop-level. The use of the program is illustrated with three standard examples: $h \rightarrow b\bar b$, $\mu \rightarrow e \overline{\nu}_{e} \nu_\mu$ and $Z \rightarrow \nu_e \overline {\nu}_e$

CALCULATING TWO- AND THREE-BODY DECAYS WITH FeynArts AND FormCalc