Pi (Ramanujan's formula) Calculator

Calculates circular constant Pi using the Ramanujan-type formula.


The calculation ends when two consecutive results are the same.
The accuracy of π improves by increasing the number of digits for calculation.

In 1914, the Indian mathematician Ramanujan discovered the formula for computing Pi that converges rapidly.
In 1987, Chudnovsky brothers discovered the Ramanujan-type formula that converges more rapidly.

Ramanujan's formula for Pi
    Pi (Ramanujan's formula)
    [1-10] /24Disp-Num
    [1]  2022/11/01 11:11   60 years old level or over / An engineer / Useful /
    Purpose of use
    Preparing an introductory course on computer science/numerical calculation
    [2]  2022/07/24 06:09   Under 20 years old / Elementary school/ Junior high-school student / Very /
    Purpose of use
    Create a working c# program to calculate pi.
    This was very useful!
    [3]  2022/03/15 09:02   50 years old level / An office worker / A public employee / Very /
    Purpose of use
    Today is pi day and I am sharing some of my favorite pi formulas with colleagues , thank you.
    [4]  2021/09/26 19:08   Under 20 years old / High-school/ University/ Grad student / A little /
    Purpose of use
    I really don't know but i've memorized upto 25 decimal places lol!
    [5]  2021/06/01 09:42   60 years old level or over / A teacher / A researcher / Very /
    Purpose of use
    Teaching students to use the 911EX.
    I find Ramanujan's math fascinating.
    [6]  2021/05/01 18:51   - / - / - /
    Purpose of use
    [7]  2020/09/06 20:04   60 years old level or over / A retired person / Very /
    Purpose of use
    Studying history of Pi accuracy and methods of calculating Pi over time
    [8]  2020/07/18 17:55   Under 20 years old / High-school/ University/ Grad student / Very /
    Purpose of use
    trying to find motivation for this formula
    can anyone provide the motivation/proof of this formula
    [9]  2020/06/19 00:46   60 years old level or over / An engineer / Very /
    Purpose of use
    Curiosity, doing research on Ramanujan
    Nice place for us geeks!
    [10]  2020/05/26 19:49   40 years old level / Others / Useful /
    Purpose of use
    Curiosity, was researching Ramanujan's formula for Pi and stumbled onto this, noticed the comments and then the questionnaire, and decided to check it all out, reply, comment, and such. FYI I am currently disabled, but was ABD Comp. Lit., PLC, with a BA in Sociology, and MA in Philosophy.


    Thank you for your questionnaire.

    Sending completion


    To improve this 'Pi (Ramanujan's formula) Calculator', please fill in questionnaire.



    Purpose of use?
    Comment/Request (Click here to report a bug).Bug report (Click here to report questionnaire.)
    Calculation bug(Please enter information such as specific input values, calculation result, correct result, and reference materials (URL and documents).)
    Text bug(Please enter information such as wrong and correct texts)
    Your feedback and comments may be posted as customer voice.