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Circular Mils Calculator

Formula

The formula to calculate the area of a circle in circular mils (A) is:

$A = \frac{\pi \cdot D^2}{4} \div (7.854 \times 10^{-7})$

Where:

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

What is a Circular Mil?

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 0.0254 mm. The area of a circle whose diameter is one mil is equal to 0.7854 mil² = (7.854 × 10⁻⁷) in².

Example Calculation

Let's assume the following value:

Diameter of the Circle (D) = 0.5 inches

Using the formula:

$A = \frac{\pi \cdot 0.5^2}{4} \div (7.854 \times 10^{-7}) \approx 249,999.4 \text{ cmil}$

The area in circular mils (A) is approximately 249,999.4 cmil.