Pi Calculations by the Buffon's method
- Calculating the value of PI using toothpicks, to illustrate Count Buffon's problem, by the students of the Worsley School of Worsley, Alberta Canada.
- http://www.worsleyschool.net/science/files/buffon/buffon3.html

David Bailey's Pi Directory
- Articles, papers, programmes, tools, algorithms on the calculation of pi.
- http://crd.lbl.gov/~dhbailey/pi/index.html

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.
- http://www.lbl.gov/wonder/bailey.html

John Mathews' bibliography for Computation of Pi
- Over a hundred references to the computation of pi.
- http://math.fullerton.edu/mathews/n2003/picomputation/PiComputationBib/Links/PiComputationBib_lnk_3.html

One Billion Digits of Pi
- Ramanujan, modular equations, and approximations.
- http://www.cecm.sfu.ca/organics/papers/borwein/index.html

Archimedes' Approximation of Pi
- Describes the method introduced by Archimedes for aproximating Pi.
- http://itech.fgcu.edu/faculty/clindsey/mhf4404/archimedes/archimedes.html