Circular mil
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A circular mil is a unit of area, equal to the area of a circle with a diameter of one mil. A mil is one thousandth of an inch. A circular mil is a convenient unit for referring to the area of the cross section of a wire or cable with a circular cross section, as the area can be calculated without reference to pi.
The area in circular mils, A, of a circle with a diameter of d mils, is given by: A = d2
In wire gauge (cable sizing), the acronym MCM or kcmil means a thousand circular mils.
[edit] Equivalence to other units of area
1 circular mil is equal to:
- about 0.7854 millionths of a square inch (1 square inch is equal to about 1.273 million circular mils)
- 5.066 E-10 square metres
- about 0.7854 square mils (1 square mil is equal to about 1.273 circular mils)
