Circular mil conversions

About circular mil

The circular mil is a unit of area in the Imperial and US customary systems of units equal to 5.067 × 10^-10 square meters (1 circular mil = 5.067 × 10^-10 m²), the standard derived unit of area in the International System of Units (SI).

The circular mil (cmil) is also equal to 5.067 × 10^-6 square centimeters (cm²), or 0.0005067 square millimeters (mm²), or 506.7 square micrometers (μm²) or 506.7 × 10⁶ square nanometers (nm²) (units of area in the SI), or about 0.7853 square mils (sq mil), or 7.853 × 10^-7 square inches (sq in) or 5.454 × 10^-9 square feet (sq ft), which are Imperial / US customary units of area.

The circular mil (cmil) 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 circular mil is the area of a circle that is 1.0 mil in diameter.

The conversion formula between square mils and circular mils:

Square Mils = π/4 × Circular Mils

The circular mil is used to specify the area of the cross section of a cable or wire. For example, a wire size of 200 kcmil or 200 MCM is a wire that has a cross-section of 200,000 circular mils.

Note:
1 MCM = 1 kcmil = 1,000 circular mils

Symbol: cmil

Plural: circular mils