Excel Pi Function: Mathematical Constant

Pi in Excel

The π is a special value known since ancient times. The pi value represents a half-rotation in the radian angle system.

Pi function in Excel

Let’s start from using pi in Excel. Syntax of PI function is very easy. There are no arguments of pi function. Excel PI formula is just =PI()

Excel Pi function returns pi value up to 15 digits.

π in Excel equals exactly 3.14159265358979

How to type pi in Excel?

You can insert π symbol in Excel. To do that go to Insert tab and click Symbol button.

Greek capital letter Pi you can find in Greek and Coptic subset.

Example of using pi in Excel

You can use pi function to calculate area of the circle. Use this pi Excel formula

=PI()*A2^2

Template

Further reading: 
Basic concepts 
Getting started with Excel
Cell References