# A to Z of Excel Functions: The PI Function

16 October 2023

*Welcome
back to our regular A to Z of Excel Functions blog. Today we look at the PI function. *

The number **π** is a mathematical
constant that is the ratio of a circle's circumference to its diameter,
approximately equal to 3.14159. The
number **π** appears in many formulae across mathematics and physics. It is an irrational number, meaning that it
cannot be expressed exactly as a ratio of two integers, although fractions such
as 22/7 are commonly used to approximate it.
Consequently, its decimal representation never ends, nor enters a
permanently repeating pattern. It is
also a transcendental number, meaning that it cannot be a solution of an
equation involving only sums, products, powers and integers. The transcendence
of **π** implies that it is impossible to solve the ancient challenge of
squaring the circle with a compass and straightedge. The decimal digits of **π** appear to be
randomly distributed, but no proof of this conjecture has ever been found. But you can find it in Excel

The **PI **function returns the number
3.14159265358979, the mathematical constant **π**, accurate to 15 digits. It has the following syntax:

**=PI()**

It has no arguments but requires the parentheses to distinguish at as an Excel function.

It should be further noted that:

- I have nothing else to say about it.

Please see my examples below:

*We’ll
continue our A to Z of Excel Functions soon.
Keep checking back – there’s a new blog post every other business day.*