A zero-dimensional (0-D) simulation of a Reversed-Field Pinch (RFP) experiment is presented. Plasma behaviour is addressed by a model that couples the toroidal and poloidal RFP magnetic fields in a prescribed, non-linear manner. The simulation is used to study pinch parameters such as magnetic field energy, power loss, plasma resistance and resistivity, and conductivity temperature as functions of time. The methodology of the 0-D simulation, its sensitivity to model-dependent effects, and application examples from the Los Alamos ZT-40M RFP experiment are given.