Pi Day is celebrated on March 14th (3/14), representing the first three digits of pi, the mathematical constant approximately equal to 3.14159. This day honors one of mathematics' most fascinating numbers — the ratio of a circle's circumference to its diameter, a value that has been calculated to over 100 trillion decimal places yet never repeats or terminates. Pi Day was first recognized in 1988 at the San Francisco Exploratorium by physicist Larry Shaw and was officially designated by the US House of Representatives in 2009. Schools, universities, and math enthusiasts worldwide use Pi Day as an opportunity to celebrate mathematics and engage students with the wonder of numbers. Activities include pi recitation contests (the current record exceeds 70,000 digits from memory), pi-themed art projects, and discussions about the history and applications of pi in engineering, physics, and computer science. The date also happens to be Albert Einstein's birthday, adding another layer of scientific significance to the celebration. Perhaps the most beloved Pi Day tradition is the eating of pie — the homophonic connection between 'pi' and 'pie' has made the baked good the unofficial food of the holiday. Pizza pies, fruit pies, and cream pies are enjoyed in classrooms and offices alike. Bakeries often offer Pi Day specials, and some enthusiasts aim to eat their pie at exactly 1:59 PM (making the timestamp 3/14 1:59, representing the first six digits of pi). Pi Day makes mathematics accessible, fun, and delicious.
Pi Day 2027 falls on Sunday, 14 March 2027. Pi Day is celebrated on March 14th (3/14), representing the first three digits of pi, the mathematical constant approximately equal to 3.14159.
There are 120 days (17 weeks, or about 4 months) until Pi Day. That is approximately 2,870 hours or 172,259 minutes from now. Use our date calculator to find the exact duration between any two dates.
There are 17 weeks until Pi Day on Sunday, 14 March 2027. That falls in week 11 of the year. Use our live countdown timer above for a real-time count including hours, minutes, and seconds.