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 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 |
Equivalence to other units of area
edit1 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.