# Diameter of a Circle Calculator

Calculate the diameter of a circle based on the circle radius, area of a circle, or circumference of a circle in chosen units.

Result:

## How to use this calculator?

- Select whether you want to calculate the diameter of a circle based on its
**radius**,**area**, or**circumference**. - Enter the
**radius**,**area**, or**circumference**, depending on what you selected in the field above. - Get your
**Diameter of a Circle**.

## How to Calculate the Diameter of a Circle?

There are several methods to calculate the Diameter of a Circle. Choose the one that allows you to perform calculations based on the data you have.

### Based on Circle Radius

Multiply the Circle Radius by 2.

**Diameter of a Circle**= 2 * Circle Radius

### Based on Circumference of a Circle

Divide Circumference of a Circle by Pi (approximately 3.14).

**Diameter of a Circle**= Circumference of a Circle / π

### Based on Area of a Circle

Multiply 2 by the square root of the Area of a Circle divided by Pi (approximately 3.14).

**Diameter of a Circle**= 2 * √(Area of a Circle / π)