PI function

This article describes the formula syntax and usage of the PI function in Microsoft Excel.

Description

Returns the number 3.14159265358979, the mathematical constant pi, accurate to 15 digits.

Syntax

PI()

The PI function syntax has no arguments:

Example

Copy the example data in the following table, and paste it in cell A1 of a new Excel worksheet. For formulas to show results, select them, press F2, and then press Enter. If you need to, you can adjust the column widths to see all the data.

Data
Radius
3
Formula	Description	Result
=PI()	Returns pi.	3.141592654
=PI()/2	Returns pi divided by 2.	1.570796327
=PI()*(A3^2)	Area of a circle with the radius described in A3.	28.27433388