Circle Calculator

If you want to determine the circle's area and perimeter or circumference, you can use our circle calculator.

In geometry, the circle is described as a 2-D closed rounded shape where each point of a circle's surface has an equal distance from the center point. At the same time, the distance between the circle's surface and the center of a circle is known as the radius. Whereas a straight line that starts from one point and ends at the opposite point, cutting the circle into two pieces is called the diameter of a circle. It is a double radius.

Formula of Circle Calculator

If you want to determine the area and circumference of a circle instantly, you can use our calculator, or to determine it manually, you can use the formula listed below:

Area of the circle = A = πr2 Square units
Circumference of the circle = 2πr units

Where,

π = 3.14

r = radius of a circle

Example

For a more precise understanding of a concept, let us solve an example below:

Suppose the radius of a circle equals 10cm, then find out the area and the circumference of a circle.

Given data

Radius = 10 cm

To Find

Area of a circle = ?
Circumference of a circle = ?

Solution

To find out the area and circumference of a circle, we will use the formula listed below:

Area of the circle = A = πr2 Square units
Circumference of the circle = 2πr units

Putting values in the formula:

Area = 3.14 × (10)2 = 314 cm2
Circumference = 2 × 3.14 × 10 = 62.8 cm

Note:

If you want to make an equation of a circle, you can use our Equation Of A Circle Calculator.

How to use the Circle Calculator?

The steps to use the circle calculator are as follows:

Step 1: Enter the value of the radius in the required input field.

Step 2: The calculator will automatically display an answer to the area and circumference of a circle on the screen.

Calculator use

You can use our circle calculator for various mathematical and geometrical principles, such as finding the area or circumference of the ring, tire, camera lenses, cake, buttons, etc.