# Circular inch conversions

area conversions » circular inch conversionsThe online converter calculator on this page allows you to select the area/surface measurement unit you want to convert to starting from circular inches (circ in). To make a conversion starting from a unit of area other than circular inch, simply click on the "Reset" button.

## What is circular inch?

### Definition:

The circular inch is a unit of area in the Imperial and US customary systems of units equal to 5.067075x10-4 square meters (1 circular inch = 5.067075x10-4 m2), the standard derived unit of area in the International System of Units (SI). It is also equal to 5.067075 square centimeters (cm2), or 506.7075 square millimeters (mm2), or 506.707.5x106 square micrometers (μm2) or 5.067075x1014 square nanometers (nm2) (units of area in the SI), or about 785,398.196 square mils, or 0.785398196 square inches (sq in) or 0.00545415414 square feet (sq ft), which are Imperial / US customary units of area.

The circular inch is an Imperial / US customary unit of area. The inch is a unit of length in the Imperial and US customary systems of units. An area of 1.0 circular inch is the area of a circle that is 1.0 inch in diameter.

The conversion formula between square inches and circular inches:

**Square Inches = π/4 × Circular Inches**

The circular inch is used to specify the area of the cross section of a cable or wire.

### Symbol:

circ in

### Plural:

circular inches

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