InvertLT is a functional numerical implementation of the described mathematical method (developed in C++ and MATLAB). It allows inverting a Laplace transform given on the real and positive axis and returns the values of an original function at a specified time interval. InvertLT is a DLL (Windows only) that can be called from MATLAB. InvertLT is an implementation of a method described in the scientific paper [2] Kryzhniy V.V. ”On regularization of numerical inversion of Laplace transforms” , J. Inv. Ill-Posed probl., 2004, Vol.12, No.3, pp.279-296 from the references list. It is a well-tested program. No problems were encountered while using it. Developed program is written in C++ and recompiled into Matlab afterwards. Original C++ version is much faster.