# Circumference Calculator

If you want to find the circumference of a circle, this circumference calculator is right for you. Besides the calculation tool, you will also learn from this page the formula for finding circumference as well as some key mathematical concepts about circles such as π.

## Definition of circumference

The circumference of a circle is the distance around the circle. While we use the word ‘perimeter’ to describe the path or the boundary of geometric figures, the word ‘circumference’ is used exclusively in circles.

## Circumference formula

The equation below finds the circumference of a circle:

`C = 2πr`

where r is the radius of the circle and π is a mathematical constant approximately equal to 3.14159.

## How to find the circumference of a circle?

Perform the steps below to find the circumference of a circle:

1. Determine the radius of a circle.
2. Plug the value into the circumference above – 2 * 3.14 * r. (If you want a more accurate result, use 22/7 as the value of π instead of 3.14)
3. Obtain the result.

## How to use the circumference calculator?

To use our circumference calculation tool, walk through the steps below: