03/14/2026
Happy Pi Day! 🥧➗
Every year on March 14 (3/14), we celebrate Pi (π), the mathematical constant that represents the ratio of a circle’s circumference to its diameter. The date 3/14 matches the first three digits of pi: 3.14.
Pi Day was first celebrated in 1988 by physicist Larry Shaw at the Exploratorium, where staff and visitors marched around a circular space and enjoyed fruit pies. Since then, the day has grown into a worldwide celebration of math, curiosity, and — of course — pie!
In 2009, the United States House of Representatives officially recognized March 14 as National Pi Day, and in 2019, UNESCO declared it the International Day of Mathematics.
Fun Pi Day traditions include:
🥧 Eating pie (a tasty pun on “pi”)
📚 Reciting digits of pi in competitions
🎉 Math-themed events and puzzles in schools and museums
A special historical moment happened on March 14, 2015, when the date 3/14/15 matched the first five digits of pi (3.1415). At 9:26:53, the date and time together represented the first 10 digits of π!
Even famous institutions celebrate it. The Massachusetts Institute of Technology often releases its college admission decisions on Pi Day, and in Princeton, people celebrate both Pi Day and the birthday of Albert Einstein, who lived there for many years.
So whether you enjoy math, puzzles, or a slice of pie, Pi Day is a fun reminder that numbers are everywhere in our world.
🥧 Happy Pi Day — keep smiling and enjoy a slice!