There is no exact value.. Pi can only be approximated! Here it is to 10,00 decimal places: Doubt you would need much more than that. pi= (approx) 3.14159 26535 89793 23846 26433 83279
http://wiki.answers.com/Q/What_is_the_exact_value_...

The full value of pi doesn't really exist. As an irrational number the value for pi can continue to be computed into infinity. It just goes on and on and on! You can find more information
http://www.ask.com/webanswers/Science/Mathematics...

Pi is equaled to
http://www.chacha.com/question/whatistheexactv...

4×tanֿ¹(1) = π. π is an irrational (and transcedental) number. It cannot be represented exactly as a fraction or a repeating decimal. It can be represented
http://answers.yahoo.com/question/index?qid=200808...
