Can the exact value of PI be calculated?

Answer 1

"Not as a decimal or fraction as there are an infinite number of digits."

This is a common and useful answer.

The *correct* answer is that PI is firstly an irrational number that cannot be calculated from any ratio (fraction).

Secondly, PI is a transcendental number that, by the definition of "transcendental", cannot be exactly calculated.

The nest you can do is to apply an infinite convergent series that becomes more and more accurate with more and more decimal places.