# Square mil conversions

area conversions » square mil conversionsThe online converter calculator on this page allows you to select the area/surface measurement unit you want 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?

### Definition:

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**

### Symbol:

sq mil

### Plural:

square mils

Below you can find a comprehensive list with conversions from square mils to other (metric, imperial, or customary) area and surface measurement units.