Pi Digits

View, copy or download up to 100 million decimal digits of π

Choose how many digits of π you want — from 100 to 100 million — then display them in your browser, copy them to the clipboard, or download them as a text or pdf file. Digits are served from a pre-computed file of 100 million decimal places.

digits (0 = none)
Download .txt 
3.1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679

The Importance of π

π in geometry — circles and spheres

π is inseparable from any circular or spherical calculation. The circumference of a circle is 2πr; its area is πr². The surface area of a sphere is 4πr², its volume ⁴⁄₃πr³. Without π, engineering, architecture, optics, and navigation would be impossible. You can explore these formulas directly with our Circle Calculator and Sphere Calculator.

π in analysis and physics

π appears far beyond geometry. Euler's identity eiπ + 1 = 0 relates the five most important constants in mathematics. The Gaussian (normal) distribution contains π in its normalization factor. Fourier transforms, quantum mechanics, electromagnetism, and general relativity all rely on π. It is one of the most universal constants in the universe.

The race to compute more digits

Computing digits of π has been a benchmark for human ingenuity for centuries — from Archimedes's polygon method, to Machin-like formulas, to modern algorithms like the Chudnovsky series. The record stood at 22.4 trillion digits in 2016 (Peter Trueb), rose to 100 trillion in 2022 (Emma Haruka Iwao at Google), and has continued to grow. Beyond the thrill of the record, computing π tests hardware reliability and algorithm correctness — an error in a chip shows up as a wrong digit.

Frequently asked questions

It lets you view, copy, or download any number of consecutive decimal digits of π, from 100 up to 100 million. The digits are served from a pre-computed text file stored on the server.
The integer part of π is 3. The N digits you select are the decimal digits that follow the decimal point: 1, 4, 1, 5, 9, … The tool prepends "3." to give you the complete representation.
"Raw" outputs the digits as a single uninterrupted string — convenient for programmatic use or searching. "Grouped by 10" inserts a space every 10 digits and a line break every 100 digits, which makes the output easier to read and count at a glance.
Yes. The server reads directly from a pre-computed file of exactly 100 million decimal digits of π. For that size, the tool switches to download-only mode (the file would be ~100 MB) — click "Download .txt" to receive the complete file.
The source file comes from pi2e.ch, produced during the 2016 world record computation by Peter Trueb, which was independently verified. The digits match all published reference values.
As of 2024, the record is held by Jordan Ranous (stormpcloud) with over 202 trillion digits, computed in March 2024. Before that, Emma Haruka Iwao at Google reached 100 trillion digits in 2022. The race is ongoing — each record pushes the boundaries of computing hardware and numerical algorithms.
For almost all practical calculations, fewer than 40 digits of π are sufficient — even NASA uses only 15 decimal places for space navigation. The real value of computing billions of digits lies in verifying computer hardware (a wrong chip produces a wrong digit), testing new algorithms, and as a mathematical challenge. Digit hunters also search for statistical patterns to probe the conjecture that π is a "normal" number.

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The digits file is taken from pi2e.ch, the website of the 2016 22.4 trillion-digit world record by Peter Trueb.

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