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
