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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 in circular mils can be calculated without reference to pi.## Equivalence to other units of area

1 circular mil (1 cmil) is equal to π/4 square mils, or π/4,000,000 square inches.
It is also approximately equal to:## References

## See also

Electricians in the US are familiar with the circular mil because the National Electrical Code uses the circular mil to define wire sizes larger than 4/0 AWG.

The area in circular mils, A, of a circle with a diameter of d mils, is given by:

- $A=d^2$

In wire gauge (cable sizing), the acronym MCM or kcmil means a thousand circular mils, the area of a wire $scriptstyle\{sqrt\{1000\}\}$ ≈ 31.62 mils (which is 0.03162 inches) in diameter.

- 0.7854 square mils (1 square mil is about 1.273 circular mils)
- equivalently, 0.7854 millionths of a square inch (1 square inch is about 1.273 million circular mils)
- 5.067×10
^{-10}square metres, 506.7 μm²

1000 circular mil (1 MCM or 1 kcmil) is (approximately) equal to:

- 0.5067 mm²

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Last updated on Thursday October 09, 2008 at 02:28:21 PDT (GMT -0700)

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This article is licensed under the GNU Free Documentation License.

Last updated on Thursday October 09, 2008 at 02:28:21 PDT (GMT -0700)

View this article at Wikipedia.org - Edit this article at Wikipedia.org - Donate to the Wikimedia Foundation

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