This page uses JavaScript to calculate π to very high accuracy. You must enable JavaScript in your browser for this page to work.
Depending on your browser and your computer's processing speed, choosing a large number of digits may cause a warning that the script on this page is executing too long. Allow the browser to continue executing the script and eventually it will finish.
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I am writing a high-precision math library for JavaScript, called BigMath.js. This page is a test of that library using the formula:
π = 48*arctan(1/18) + 32*arctan(1/57) − 20*arctan(1/239)
If you liked this page, you might also like my high-precision nth root calculator page.
The same π calculation algorithm, only in the form of a Windows batch file, was featured as a Stupid Coding Trick by The Daily WTF.