Circular Mils Calculator

Calculate Area in Circular Mils

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:

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:

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.