Square mil conversions

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Convert square mils to

The square mil conversion selector above selects the area/surface measurement unit to convert to starting from square mils (sq mil). To make a conversion starting from a unit of area other than square mil, simply click on the "Reset" button.

What is square mil?

The square mil is a unit of area in the Imperial and US customary systems of units equal to 6.4516x10-10 square meters (1 square mil = 6.4516x10-10 m2), the standard derived unit of area in the International System of Units (SI). It is also equal to 6.4516x10-6 square centimeters (cm2), or 6.4516x10-4 square millimeters (mm2), or 645.16 square micrometers (μm2) or 6.4516x108 square nanometers (nm2) (units of area in the SI), or about 1.273 circular mils (cmil), or 10-6 square inches (sq in) or 6.94444444x10-9 square feet (sq ft), which are Imperial / US customary units of area.

The square mil is an Imperial / US customary unit of area. The mil is a unit of length in the Imperial and US customary systems of units. An area of 1.0 square mil is the area of a square that is 1.0 mil on each side.

The conversion formula between square mils and circular mils:

    Square Mils = π/4 × Circular Mils


sq mil


square mils