Use this handy calculator to work out the **equivalent cross-sectional area of a wire in circular mils from its diameter in mils**.

## Circular Mils Calculator

** Note:*

*Circular mils are used in the electrical industry as a measure of the cross-sectional area of a wire. The larger the circular mils (cmils) value, the thicker the wire.*

**Worked Example 1: Convert 500 mils to cmils**

Using the calculator, 500 mils =50,000 cmils.

**Worked Example 2: Convert 125 mils to cmils**

From the calculator, 125 mils equals 15,376 cmils.

**Example 3: Convert 100 mils to cmils**

Using the calculator, 100 mils =10,000 cmils.

### Mils to Circular mils Formula

How to calculate circular mils from mils.

**Use this formula below to calculate cmils from mils:**

*circular mils = (diameter of the wire or conductor in mils)* x *(diameter of the wire or conductor in mils)*

If the diameter of a wire is 100 mils, the circular mils equivalent = (100)**²** = 10,000 cmils.

**Another example:**

Using the formula, if the diameter of a conductor is 3 mils, then the circular mils equivalent is **3 ² = 9 circular mils (cmil). **

**Related Questions**

#### Converting mils to inches and mm

Use the calculator below to convert the diameter of a wire in mils to inches or mm.

**Related Topics**

### Circular Mils to Mils Converter

You can use the converter below to convert from circular mils to mils.

**Related Questions**

### 1. Formula to convert Inches to circular mils

To work out circular mils from inches, use the conversion:

**1 inch = 1,000,000 circular mils**

### 2. Formula to convert mm to circular mils formula

To work out circular mils from mm, use the conversion:

**1 mm = 39,370 circular mils**

## 3. Converting Square mils to Circular mils

A square mil is the area of a square whose sides are 1 mil.

#### Square mils to circular mils formula

To convert square mils to circular mils, use the formula: **1 circular mil = 1.27323 x number of square mils.**

#### Circular mils to square mils formula

To convert circular mils to square mils, use the formula: **1 square mils = circular mils / 1.27323**

**Related topics**