The longest calculation as of December 2013 goes to 12.1 trillion digits.
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Pi has been calculated to over 1 trillion places, but it has an infinite number of places since it's sequence never repeats.
Take the number before the decimal point as the whole number. Take the part after the decimal point. As it has been measured it will be a terminating decimal so put it over 1 followed by the same number of zeros as digits in the decimal number and simplify to make the fractional bit. eg measured as 2.75 would be 2 75/100 = 2 3/4
You do a long division - using whichever method you have been taught. Don't stop with a remainder but carry on until you see a repeating pattern emerging (after 6 decimal places).
It is 8.0 rounded to one decimal point.
Oh honey, I don't have time to recite pi to 100 quadrillion digits for you. Just know that pi is an irrational number that goes on forever without repeating. So, if you need that many digits of pi, I suggest you grab a calculator and have fun with it!