3.141592654
* * * * *
10 trillion digits as of July 2012.
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355/113 = 3.141593
main fraction:22/7 most accurate fraction:355/133
The original manuscripts
Archemedes
The most accurate calculation of pi is currently estimated to be around 31.4 trillion decimal places. This calculation was achieved using supercomputers and advanced mathematical algorithms. However, for most practical purposes, using pi to just a few decimal places (3.14159) is sufficient.