Abstract: A method for calculating the parasitic capacitance and resistance in a semiconductor device is disclosed. According to the preferred embodiment, a layout file containing the shapes of semiconductor interconnects and a technology file describing the fabrication steps are used to generate a 3D model of the structures. The surfaces of the model are discretized and a double boundary integral equation is solved to compute the field allowing various interconnect parameters to be computed, including resistance, self-capacitance, cross-capacitance, and current density. Further, the preferred embodiment discloses how numerical analysis can be efficiently performed on typical large interconnect and substrate structures.