Square mil

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square mil

Unit system| Imperial and US customary measurement systems
Unit of| Area
Symbol| mil2
Conversions
1 mil2 in ...| ... is equal to ...
Imperial and US customary|  10−6 in2
SI units|  6.45160×10−4 mm2

A square mil is a unit of area, equal to the area of a square with sides of length one mil. A mil is one thousandth of an international inch. This unit of area is usually used in specifying the area of the cross section of a wire or cable.

## Equivalence to other units of area[edit]

1 square mil is equal to:

* 1 millionth of a square inch (1 square inch is equal to 1 million square mils)
* 6.4516×10−10 square metres
* about 1.273 circular mils (1 circular mil is equal to about 0.7854 square mils). 1.273 ≈ 4/π and 0.7854 ≈ π/4.

## See also[edit]

* Circular mil
* Area of a circle