Reaction Mechanism Generator (RMG) is an open-source software that has been widely used to generate detailed kinetic models for combustion. It has recently been extended to heterogeneous catalysis. The current work adds linear scaling relationships to the software. RMG uses a graph-based approach to represent gas-phase and surface species, with atoms as nodes and bonds as edges. Thermodynamic properties are either obtained from a built-in database or are estimated using group additivity, machine learning, or statistical thermodynamics. Chemical reactions are sorted into predefined families containing reaction templates and recipes to convert chemical graphs from reactants to products. Reaction rates are obtained from a kinetics database or estimated using the Bell-Evans-Polanyi (BEP) principle, Equation (1). This states that the difference in activation energy between two similar reactions of the same family is proportional to the difference in the enthalpies of reaction,