The Excel PI Function

The Excel PI function returns the value of the mathematical constant π (pi), accurate to 15 digits (14 decimal places).

I.e. the function returns the value 3.14159265358979

The Pi function takes no arguments and therefore has the syntax:

PI( )

Pi Function Examples

The spreadsheet below shows three examples of the Excel Pi function.

1=PI( ) 
2=SIN( PI( ) / 2 ) 
3=2 * PI( ) * 5- circumference of a circle with radius 5

Further examples of the Excel Pi function are provided on the Microsoft Office website.