NATIONAL DAYSCIENCE & TECH

National Pi Day

Today we unite to celebrate math and pie in a delightful way.

MAR14

Sunday, March 14Every year on March 14

days to go

Roots: Celebrated since 1988
Vibe: A blend of math and culinary joy
Also on Mar 14: International Day of Mathematics · Children’s Craft Day · Learn About Butterflies Day
Hashtag: #NationalPiDay

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3 ways to celebrate

AT HOME

Bake a pie

Make your favorite pie from scratch and enjoy every slice.

WITH FRIENDS

Hold a pie contest

Everyone brings a pie and the group crowns a winner.

AT WORK OR SCHOOL

Recite pi together

See who can recite the most digits of pi from memory.

Fast facts

Pi is approximately 3.14

2009Pi Day was recognized by the U.S. House of Representatives in 2009

The story

Pi Day is celebrated on March 14 (3/14) in honor of the mathematical constant π (pi), which begins with the digits 3.14. This day not only highlights the importance of pi in mathematics, particularly in geometry, where it represents the ratio of a circle's circumference to its diameter, but also offers a unique opportunity to indulge in one of America's favorite desserts: pie. As math enthusiasts and dessert lovers unite, the day has become a festive occasion across the country.

Read the full story

The origins of National Pi Day can be traced back to 1988 when physicist Larry Shaw first celebrated it at the San Francisco Exploratorium. Over the years, it has grown in popularity and gained official recognition, especially after the U.S. House of Representatives passed a resolution in 2009 declaring March 14 as National Pi Day. Events range from educational activities in schools to pie-eating contests, creating a fun and engaging atmosphere for participants of all ages.

Celebrating National Pi Day can be both educational and delicious. Schools often incorporate lessons about pi into their curriculum, allowing students to explore the mathematical concepts behind this fascinating number. Meanwhile, bakeries and home cooks prepare an array of pies, from sweet to savory, to enjoy during the festivities. This unique blend of math and culinary arts makes Pi Day an engaging experience for families and communities alike.

National Pi Day has transcended borders, inspiring celebrations worldwide. Countries like Canada and the United Kingdom also observe the day, often with similar enthusiasm. As enthusiasts share their love for pi and pies through social media, the global community comes together to appreciate the intersection of mathematics and culinary delight, proving that learning can indeed be a flavorful experience.

Did you know?

What is Pi?

Pi is an irrational number, meaning it has an infinite number of decimal places without repeating.

First 10 Digits of Pi

The first 10 digits of pi are 3.141592653.

Pi in Nature

Pi can be found in various natural patterns, including the shape of planets and the structure of DNA.

Pi Day Activities

Common activities include pie-eating contests, math trivia, and baking events.

Famous Pi Day Celebrations

Some schools host large gatherings with educational booths and competitions.

Pi's Symbol

The Greek letter π was first adopted as a symbol for pi by mathematician Leonhard Euler in the 18th century.

Pi and Technology

Pi is essential in fields such as engineering, physics, and computer science.

Around the world

Every culture celebrates a little differently.

USUnited StatesNational Pi Day is widely celebrated in schools and communities.
GBUnited KingdomSome schools in the UK also recognize Pi Day with fun activities.
CACanadaCanadian math enthusiasts join in the Pi Day festivities.
AUAustraliaAussies celebrate Pi Day with pie-themed events.
INIndiaMath clubs in India often host events to mark Pi Day.
DEGermanyGerman students engage in activities related to pi on this day.