There are infinitely many digits of pi, because pi is an irrational number and its decimal expansion never ends and never repeats.

Quick Scoop: Core Answer

  • Pi cannot be written as a finite decimal or a fraction of whole numbers, so its digits go on forever.
  • As of recent computations, computers have calculated over 100 trillion digits of pi’s decimal expansion, but that’s just a finite window into an endless sequence.

How Many Digits Are Known Today?

  • Modern records report more than 100 trillion digits of pi have been computed by high‑performance computers.
  • A recent Pi Day report highlighted that we know “more than 105 trillion digits of pi,” pushing the boundary of what’s been explicitly calculated.
  • You can even browse or download huge chunks of these digits from specialized websites that offer millions to trillions of digits for research or fun.

Tiny Example vs. Huge Reality

  • Everyday math usually uses pi as 3.14 or 3.14159, which is just the beginning of its infinite expansion.
  • Some sites let you see the first 10,000 digits on screen, and provide files for up to a million digits or more.

Do We Really Need That Many Digits?

  • NASA engineers note that for most space‑related calculations, only a small number of decimal places are actually needed; you don’t need anywhere near trillions of digits to navigate the solar system.
  • One NASA explanation points out that a few dozen decimal places are more than enough for extremely precise physical calculations across cosmic distances.

Fun Challenge Side

  • Enthusiasts memorize tens of thousands of digits of pi for world records, even though science and engineering rarely use more than a handful.

Mini FAQ

So, how many digits of pi are there?

  • Mathematically: infinitely many digits, because pi is irrational and never terminates.
  • Currently known by computation: more than 100 trillion digits have been explicitly calculated and stored.

TL;DR:
Pi has infinitely many digits, but humans have computed over 100 trillion of them so far.

Information gathered from public forums or data available on the internet and portrayed here.