RestCal is a resistance calculation program that calculates the boundary conditions using a Finite Element Method to calculate Resistance values for; Thickness, Material and Temperature using multiple units of measure.

The RestCal program works on a closed, 0-width polyline boundary. By selecting a segment from one side and selecting a segment on an opposite side, the Resistor Calculation dialog box will appear. If polylines are on the same segment, an opened polyline (not closed) or a polyline that intersects itself or another polyline, the program will display warning dialogs and display a message of the problem and allow user to pick another segment or close the program.