Pi Digit Generator

Number of decimal digits (up to 5,000) 50

π to the requested digits

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Computed in your browser using the Machin formula (π = 16·arctan(1/5) − 4·arctan(1/239)) with arbitrary-precision arithmetic — not a hardcoded lookup table, so any digit count up to 5,000 is calculated on the spot.

<iframe src="https://olltools.com/embed/generator/pi-digit-generator" width="100%" height="400" frameborder="0"></iframe>

Calculate pi (π) to up to 5,000 decimal digits, computed live in your browser — not a pre-baked lookup table.

How it works

Enter how many decimal digits of pi you want (up to 5,000)
The digits are computed instantly using the Machin formula with arbitrary-precision arithmetic
Copy the result, or share the link

Frequently asked questions

How is this calculated?

Using the Machin formula (π = 16·arctan(1/5) − 4·arctan(1/239)), evaluated with BigInt-based fixed-point arithmetic in your browser. It's not reading from a stored table of digits — it's actually computed each time.

Why is there a 5,000-digit cap?

To keep the calculation fast and safe to run directly in your browser without noticeable lag.

Has the output been checked against known digits of pi?

Yes — verified against a reference value of the first 100+ known digits of pi during development.

#PiDigitGenerator#DigitsOfPiCalculator#PiDayCalculator#HowManyDigitsOfPi

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From the blog

generator

Most "pi digit" tools don't say how they compute it — ours uses the same 300-year-old formula and shows its work

Generating digits of pi isn't hard to get subtly wrong. We used the classic Machin formula with arbitrary-precision arithmetic and checked the output against 100+ known reference digits before shipping it.

2026-09-02

Update history

2026-09-03 Bounded numeric fields are now sliders instead of number inputs.
2026-09-02 Launched: pi digit generator using the Machin formula, up to 5,000 decimal digits, computed live client-side. Verified against known reference digits of pi.