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The advantage of using the units called circular mils is that the cross-sectional area of a solid conductor is the diameter of that conductor squared. For example, a solid conductor with a diameter of 0.0808 inches (80.8 mils) has a circular mil area of (80.8)2 or 6,529 circular mils. To double-check this, look at Table 2 on the row for 12 AWG. A circular mill is defined by the simple formula: Where: A = Area in CM. d = Diameter in mils (a mil is 1/1000 of an inch) A common point of confusion is that the diameter of the circle also defines the length of the sides of the square that would encompass the circle, so it seems that this formula should give us square mills (see illustration.
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