# How To Calculate The Area Of A Circle ## Example

=PI()*POWER(C3,2)

## Generic Formula

Radius – This is the radius of the circle which you want to calculate the area of.

## What It Does

This formula will calculate the area of a circle given its radius.

## How It Works

The area of a circle is given by Pi*Radius^2 where Pi is a constant approximately equal to 3.14159265. Excel has this constant built in as a function with no parameter inputs PI().

The POWER function will take any number and raise it to the power of any other number. POWER(Radius,2) will return the square of the Radius. In our example, POWER(3,2) results in 9, and 3.14159265*9 = 28.27.

## About the Author ### John MacDougall

John is a Microsoft MVP and qualified actuary with over 15 years of experience. He has worked in a variety of industries, including insurance, ad tech, and most recently Power Platform consulting. He is a keen problem solver and has a passion for using technology to make businesses more efficient.