Websites on the subject of calculating pi, including research papers, algorithms, etc. Software programs for calculating pi are in a subcategory.
Archimedes' Approximation of Pi
Describes the method introduced by Archimedes for approximating Pi.
Bailey on Pi
Briefly explains David Bailey's work with NASA's supercomputers and the development of a workable formula to evaluate Pi for any number of decimal places.
David Bailey's Pi Directory
Articles, papers, programmes, tools, algorithms on the calculation of pi.
Fabrice Bellard's PI page
Showcases digit extraction and FFT multiplication algorithms.
One Billion Digits of Pi
Ramanujan, modular equations, and approximations.
Last update:July 1, 2016 at 17:24:08 UTC