# Square Inches of a Circle Calculator

With this square inches of a circle calculator, you can easily **calculate the area of a circle in square inches**. As square inch is a widely used unit, especially in the construction industry, it is essential to understand how to find the square inches of a circle.

This article will help you understand **what the square inches of a circle is** and **how to find the square inches of circle**. The article will include a practical example to help you understand this concept and its application.

## What is the square inches of a circle?

Square inches of a circle is the **area of a circle converted to square inches**. As square inches is an **imperial unit**, this is **mainly used in countries such as the United States, Myanmar, and Liberia**.

Although most countries nowadays use metric units, such as meters, kilometers, centimeters and so on, units like square inches are still widely used in some industries. For instance, **square inches is widely used in the construction industry**.

## How to find the square inches of a circle?

To understand the calculation, let's take the following circle as an example:

- Shape: circle
- Dimension: 2D
- Radius: 3 cm
- Diameter: 6 cm

**Determine the radius of the circle**

The first step is to determine the radius of the circle. The radius of the circle in our example is

`3 cm`

.

**Convert the radius into inches**

For the next step, we need to convert the radius into inches. As the radius of the circle in our example is in

`cm`

, we need to multiply the number by 0.3937. Hence, the radius of the circle is`1.181 in`

.

To convert different units to inches, please refer to the table below or refer to our length converter.

Units | millimeter (mm) | centimeter (cm) | meter (m) | kilometer (km) | inch (in) | foot / feet (ft) | yard (yd) | mile (mi) | nautical mile (nmi) |
---|---|---|---|---|---|---|---|---|---|

1 inch (in) | 25.4 | 2.54 | 0.0254 | 0.0000254 | 1 | 0.08333 | 0.02778 | 0.000015783 | 0.000013715 |

**Calculate the square inches of a circle**

The final step is to calculate the square inches of a circle. We can achieve this by applying the circle area formula:

`area = π * radius²`

Thus, the square inches of the circle is

`π * (1.181 in)² = 4.3825 in²`

, which is`4.3825 square inches`

.

## Why should we calculate the square inches of a circle?

Now that we understand what the square inches of a circle is, we can discuss the importance of this concept. As mentioned earlier, a square inch is a unit that is widely used in the construction industry. Hence, **understanding the square inches of a circle can help you to communicate better with people in the industry**.

For example, if you want to buy a circle carpet, it is better to tell them how many square inches or square feet you want the carpet to be, instead of square meters or square centimeters.

## Here are some related calculators

Apart from our square inches of a circle calculator, you may also find some of the circle-related calculators below helpful:

- Circle calc: find c, d, a, r
- Area of a circle calculator
- Circumference calculator
- Equation of a circle calculator
- Circle measurements calculator
- Circle formula calculator
- Radius of a circle calculator
- Diameter of a circle calculator
- Circle length calculator
- Circumference and area of a circle calculator
- Circle perimeter calculator
- Circumference to diameter calculator
- Square footage of a circle calculator
- Arc length calculator

## FAQ

### What is a circle?

A circle is **a planar closed curve made of a set of all the points that are at a given distance from a given point** - the center. The circle can also be defined as the locus of points at the same distance from a given fixed point.

### What is a radius?

A radius is a **line from the centre of the circle to the edge of the circle**. It is half of a diameter, which is a line stretches from an edge of a circle to another edge of the circle.

### How do I calculate the square inches of a circle?

We can calculate the square inches of a circle in three steps:

**Determine the radius of the circle****Convert the radius into inches****Calculate the square inches of a circle**