What is the fourth digit of π?

The story behind the answer

Counting from the very first digit of pi, its decimal expansion begins 3.141592..., so the first four digits are 3, 1, 4, 1. Therefore, the fourth digit is 1.

Pi is the ratio of a circle’s circumference to its diameter. It’s irrational, so its digits never end or repeat, which is why we memorize the leading ones. A handy mnemonic is "May I have a large container of coffee?" (word lengths 3-1-4-1-5-9-2-6-5-3) to recall 3.141592653. Think "3, then 1-4-1" to remember the fourth digit is 1.