# Area of a Circle Calculator

Calculate the area of a circle using the radius, diameter, or circumference with the circle area calculator.

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## How to Calculate the Area of a Circle

The area of a circle is the space occupied by the shape. There are a few ways to find the area of a circle.

The first way to calculate area is to use the circle area calculator above. The second way is to use a circle area formula.

### Circle Area Formulas

To calculate the area of a circle, you’ll need the radius, diameter, or circumference.

Then, use one of the following formulas.

#### Find Area Using Radius

The formula to find the area using the radius is:

A = π × r²

Thus, the area of a circle *A* is equal to pi times the radius squared.

#### Find Area Using Diameter

The formula to find the area using the diameter is:

A = π × (d / 2)²

The area *A* is equal to pi times the diameter divided by 2, squared.

#### Find Area Using Circumference

The formula to find the area using the circumference is:

A = π × (C / 2π)²

The area *A* is equal to pi times the circumference divided by 2 times pi, squared.

Give our circle calculator a try and solve a circle’s dimensions, including the radius, diameter, and circumference.