Birthday in Pi

Tool Guide

Tool Introduction

The Online Pi Birthday Position Lookup Tool is used to look up the position where your birthday number appears in pi—that is, at which digit it appears.

The Pi Birthday Position Lookup Tool supports birthday searches for the 200 years from 1900-2100. The system searches within the first 1 billion digits of pi and gives the position of the first occurrence.

Because pi is an infinite, non-repeating decimal, as long as there are enough digits, any birthday number combination will most likely appear. Legend has it that among the first 1 billion digits of pi, only 2 birthdays do not appear—could yours be one? Give it a try.

If you need to look up a non-birthday number combination, you can use PILookup, which supports up to 50-digit number combinations and a search range of the first 5 billion digits of pi.