21 sept. 2023 · You will then see results for the cross-sectional area, wire gauge in AWG, and the diameter of the cable. Much easier to use than a wire size chart! Much easier to use than a wire size chart! 💡 The unit of area circular mil (cmil) is equal to the area of a circle with a diameter of one mil, which is a thousandth of an inch (0.0254 mm).