# Radius of Circle Calculator

'Cuemath's Radius Calculator' is a free online tool that calculates the radius of a circle

## What Is Radius of Circle Calculator?

The distance from the center to any point on the circumference of a circle is the radius. The size of the circle changes when the length of the radius varies. 'Cuemath's Radius Calculator' is a free online tool that calculates the radius of a circle within a few seconds.

Note: Enter values for diameter, area and circumference up to 3 digits.

## How to Use the Radius Calculator?

Follow the steps mentioned below to find the radius of a circle.

**Step 1**- Select the correct option from the drop-down to input the value: Diameter, Area and Circumference**Step 2**- Enter the value for the option you chose in the first step and click on "**Calculate**" to find the radius of the circle.**Step 3**- Click on "**Reset**" to clear the fields and enter the new value.

## How to Calculate Radius?

The radius of a circle can be calculated when the diameter is known. The formula for the radius of a circle when the diameter is given is: **Radius = Diameter / 2**

The radius of a circle formula when the circumference is given is: **Radius = Circumference / 2п**

The radius of a circle formula when the area is given is: **Radius = ⎷(Area of Circle / п)**

Let us look at an example to understand this better.

**Solved Example :**

If the diameter of a circle is 7 units, find the radius.

**Solution :**

Diameter = 7 units

We will use the formula of the radius.

Radius = Diameter / 2

= (7/2) units

= 3.5 units

Similarly you can use the formula mentioned for finding the radius if the area and circumference of the circle are given.

Now, use our online radius calculator and find the radius if the circumference of a circle is

- 15 units
- 100 units