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Circular Mils Calculator: Simplify Your Electrical Calculations

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What are Circular Mils?

Circular mils, often abbreviated as “cmil,” are a unit of area used primarily in electrical applications, such as measuring the cross-sectional area of wires or cables. A circular mil represents the area of a circle with a diameter of one-thousandth of an inch (0.001 inches).

Importance of Circular Mils in Electrical Applications

Circular mils play a significant role in electrical engineering, as they help determine critical parameters like wire size and current-carrying capacity. Calculating the area of a wire in circular mils allows engineers and technicians to select the appropriate wire size for their specific applications, ensuring the safe and efficient operation of electrical systems.

Understanding the Circular Mils Calculation

The Circular Mils Formula

The formula to calculate the area of a circle in circular mils is as follows:

A = (piD^2 / 4) / (7.85410^-7)


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

Key Components of the Formula: Diameter and Area

The two essential components of the circular mils formula are the diameter and the area. The diameter (D) represents the size of the wire or cable, while area (A) corresponds to the cross-sectional area of the wire in circular mils.

Circular Mils Calculator: A Practical Tool

Features of the Circular Mils Calculator

Our Circular Mils Calculator is a user-friendly tool that simplifies the calculation process, allowing users to quickly obtain results. By providing an accessible and easy-to-use calculator, students and professionals can focus on analyzing the implications of circular mils in their studies or work.

How to Use the Calculator

Using the Circular Mils Calculator is straightforward:

  1. Enter the diameter of the circle (in inches) into the input field.
  2. Click the “Calculate” button to perform the calculation.
  3. The calculated area in circular mils will be displayed.

To reset the input values and result, simply click the “Reset” button.

Practical Applications and Use Cases

The Circular Mils Calculator is a valuable tool for electrical engineers, electricians, and students, as it enables them to quickly determine the appropriate wire size for a specific application. Additionally, this tool is useful for comparing the cross-sectional areas of different wire sizes, facilitating the design of safe and efficient electrical systems.

Frequently Asked Questions (FAQs)

What units are used for diameter and area in the calculator?

The diameter is measured in inches, while the area is measured in circular mils (cmil).

How accurate is the Circular Mils Calculator?

The Circular Mils Calculator provides accurate results, as long as you input the correct diameter value.

Can I use the calculator for different wire shapes?

The calculator is designed for circular wires or cables. For other wire shapes, additional calculations or adjustments may be necessary.

Why are Circular Mils important in electrical engineering?

Circular mils are essential for determining wire size and current-carrying capacity in electrical systems. Proper wire sizing is crucial for safe and efficient operation.


Understanding and calculating circular mils are essential skills for electrical engineers, electricians, and students in related fields. Mastery of these concepts ensures the selection of appropriate wire sizes, promoting the safe and efficient operation of electrical systems.

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