Square mil

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.

square mil
Unit systemImperial and US customary measurement systems
Unit ofArea
Symbolmil2
Conversions
1 mil2 in ...... is equal to ...
   Imperial and US customary   1×10−6 in2
   SI units   6.45160×10−4 mm2

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). Where 1.273 is (1÷(π÷4)) and where 0.7854 is (π÷4).

See also

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