What is Pi Day

Discover the magic of Pi Day and celebrate the mathematical constant pi (π) on March 14th. Learn about its history, significance, and fun facts in this article.


Pi Day is an annual celebration of the mathematical constant π (pi), which is approximately 3.14159. This day is observed on March 14th (3/14) since the first three digits of pi are 3.14. Pi Day is an opportunity to appreciate the beauty of mathematics and its impact on our daily lives.

History of Pi Day

Pi Day was first celebrated in 1988 by physicist Larry Shaw at the San Francisco Exploratorium. The idea caught on, and in 2009, the U.S. House of Representatives officially recognized March 14th as National Pi Day. Since then, Pi Day has gained popularity worldwide, with math enthusiasts and educators organizing events and activities to commemorate this unique day.

Significance of Pi

Pi is a mathematical constant that represents the ratio of a circle’s circumference to its diameter. It is an irrational number, meaning it cannot be expressed as a simple fraction, and its decimal representation never repeats or terminates. Pi is used in various fields such as mathematics, physics, engineering, and even art and music.

Celebrating Pi Day

On Pi Day, people engage in various activities to celebrate the beauty of mathematics. Some schools hold math competitions, bake pies, or participate in pi recitation contests (memorizing digits of pi). Others attend lectures on the significance of pi or explore the history of this fascinating number.

Fun Facts about Pi

  • The record for memorizing the most digits of pi is held by Rajveer Meena, who recited 70,000 digits in 9 hours and 27 minutes in 2015.
  • Albert Einstein was born on Pi Day (March 14, 1879), adding another layer of significance to this mathematical celebration.
  • There is a Pi World Ranking list that ranks individuals based on how many digits of pi they can recite from memory.


Pi Day is a fun and educational way to celebrate the beauty of mathematics and its impact on our world. Whether you’re a math enthusiast or just looking for an excuse to enjoy a slice of pie, Pi Day is a day worth celebrating. So, mark your calendars for March 14th and join in the festivities!

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