What is Pi Day and why do we celebrate it

Celebrate Pi Day on March 14th to honor the mathematical constant pi (π) and its significance in our lives. Learn why this seemingly obscure number is celebrated worldwide.


Pi Day is celebrated every year on March 14th (3/14) around the world. It is a day to honor the mathematical constant pi (π), which represents the ratio of the circumference of a circle to its diameter. But why do we celebrate this seemingly obscure number? Let’s delve deeper into the history and significance of Pi Day.

History of Pi Day

The first Pi Day celebration was organized by physicist Larry Shaw in 1988 at the Exploratorium, a science museum in San Francisco. Shaw chose March 14th because it corresponds to the first three digits of pi (3.14). Since then, Pi Day has gained popularity and is now recognized by mathematics enthusiasts, educators, and students worldwide.

Significance of Pi

Pi is an irrational number, meaning it cannot be expressed as a simple fraction. Its decimal representation goes on infinitely without repeating, making it a fascinating and mysterious mathematical constant. Pi is used in various branches of mathematics, science, and engineering to calculate areas, volumes, and other important measurements.

Celebrating Pi Day

On Pi Day, people engage in various activities to celebrate the beauty of mathematics and pi. Some common ways to celebrate Pi Day include baking pi-themed pies, organizing math competitions, reciting digits of pi, and learning about the history and significance of pi. Schools often incorporate pi-related activities into their curriculum to make learning math more fun and interactive.

Examples of Pi Day celebrations

  • In 2009, the US House of Representatives passed a resolution recognizing March 14th as National Pi Day to promote mathematics education and literacy.
  • In 2015, physicist Daniel Tammet set a new world record for reciting 22,514 digits of pi from memory at the Oxford Museum of the History of Science.
  • Many companies and restaurants offer discounts or special deals on Pi Day, making it a fun and delicious celebration for all.


Pi Day is not just a day to indulge in delicious pies but also a day to appreciate the beauty and importance of mathematics in our daily lives. By celebrating Pi Day, we acknowledge the role of pi in shaping our understanding of the world around us and inspire future generations to explore the wonders of mathematics.

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