Pi Digits Explorer

How to use it

1. Enter a from and to position (1 to 1000). Position 1 is the first digit after the decimal point, the 1 in 3.14159.
2. The digits show in groups of 10 with position labels, so you can read coordinates at a glance.
3. Optionally set a highlight range to mark a stretch, such as positions 763 to 768, where pi famously runs six nines.
4. Fill in a digit from 0 to 9 to count it inside your range, or leave it empty to see counts for all ten digits.
5. Type a 6-digit birthday like 199001 to search the first 1000 digits, and copy the report if you want to keep it.

Common use cases

• Pi Day activities - pull up digits for classrooms, quizzes and trivia games.
• The birthday test - check where a date string shows up in pi, a classic statistics exercise.
• Checking memorization - rehearse digits in windows of 10, 20 or 50 positions.
• Statistics practice - count digit frequencies over a range and compare with a uniform expectation.

Why it stays private

The digit table is built into the page as a constant, so nothing is fetched or uploaded. Queries and birthday searches run entirely in your browser.

FAQ

Q: Where do the digits come from? A: The first 1000 digits after the decimal point are stored as a constant in the tool and were verified against pi computed with a high-precision Machin formula before shipping.

Q: Why does my birthday not appear? A: There are only about 1000 possible starting positions here, and a specific 6-digit string has a low chance of landing in one of them. Most 6-digit dates are not in the first 1000 digits; a much longer table would be needed.

Q: What is special about positions 763 to 768? A: That stretch is the run of six nines in pi, known as the Feynman point. The highlight sample is preset to it so you can see it right away.