Pi (Ï€) Day - Online

Pi (π) Day “Round” Table + Listening Party
Free online event - join via Facebook or YouTube

No matter how you slice it, you won’t want to miss Pi (π) Day - we’ll be celebrating differently this year, but you can still join the party for this irrational and transcendent figure. Math artist John Sims will host a live listening session featuring work from his music project 31415: The Pi Collection. This performance will present his work: "Pi Day Anthem" video, a spoken-word "Dear Pi" letter, and the world premiere of a new "Jazz Pi" composition. Then join our panel of pi enthusiasts dishing out bites of pi trivia and pi art (along with a side of puns and pi-kus), and ask your questions and share your pi stories in the live chat.

Check out our pi activities to snack on at home, four new pi-themed videos in the player on this page, new servings of pi curiosities, and share your own celebrations below.

What is Pi (Ï€) Day?

Founded in 1988 at the Exploratorium, Pi (π) Day has become an international holiday, celebrated live and online all around the world. The numbers in the date (3/14) match the first three digits of the mathematical constant pi (π).

What is π, anyway? Divide any circle’s circumference by its diameter; the answer (whether for a pie plate or a planet) is always approximately 3.14, a number we represent with the Greek letter π. Keep calculating π’s digits with more and more accuracy - as mathematicians have been doing for 4,000 years - and you’ll discover they go on literally forever, with no pattern.