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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

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.

Equivalence to other units of area

See also