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TPEcalc is a C++ program for calculation of two-photon exchange (TPE)amplitudes in elastic electron-hadron scattering, based on the dispersionmethod. It is a command-line tool which accepts kinematical parameters (Q^2 andepsilon) as input and returns TPE amplitudes. It can do calculations forproton, neutron and pion targets. Any spin 1/2+ or spin 0- target is supported,if the user supplies all necessary form factor parameterizations. This paperdescribes how to use TPEcalc and outlines underlying theory. The program sourcecode can be downloaded from http://tpe.bitp.kiev.ua/

TPEcalc: a program for calculation of two-photon exchange amplitudes