Enter the diameter of a circle into the calculator to determine the area of the circle in circular mils.

## Circular Mils Formula

The following formula is used to calculate the area of a circle in circular mils.

A = (pi*D^2 / 4) / (7.854*10^-7)

• Where A is the area in circular mils (cmil)
• D is the diameter of the circle (inches)

## What is a circular mil?

Definition:

A circular mil is defined as the area of a circle whose diameter is one mil. One mil is equal to one-thousandth of an inch or .0254mm.

The area of a circle whose diameter is one mil is equal to .7854 mil^2 = (7.854*10^-7) in^2.

## How to calculate circular mils?

Example Problem:

The following example problem shows how to calculate the area of a circle in circular mils.

First, determine the diameter of the circle. In this case, the circle has a diameter of .054 inches.

Next, calculate the area of that circle. Using the formula for the area of a circle, this is calculated as: A = (pi*.054^2 / 4) = 0.00229022104

Finally, divide the area above by the area of a circular mil.

A = (pi*D^2 / 4) / (7.854*10^-7)

A = .00229022104 / (7.854*10^-7)

A = 2916 circular mils