A trace configuration calculating method is applied to pivotal connection of a first workpiece and a hinge. A first trace space is formed at a position where the hinge is pivoted to the first workpiece. A first trace is disposed through the first trace space. The trace configuration calculating method includes the hinge and the first workpiece rotating first and second angles to make the first trace space have first and second contour cross-sections respectively, overlapping the first and second contour cross-sections to form a first intersection area, calculating a first maximum inscribed circle according to the first intersection area, and determining a first optimal center and a first maximum diameter of the first trace according to the first maximum inscribed circle.