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Happy Pi Day

Celebrate Pi Day with your students on March 14 (3.14) or any time of year!

MATHCOUNTS mathletes form the symbol for Pi at the Massachusetts state competition.

While it's true that pie is yummy, its round shape also has significance. Pi is the ratio of the circumference of a circle to the diameter — a mathematical constant approximately equal to 3.14 and is widely used by engineers, teachers, parents, students and more to solve math problems. Have some fun with Pi!

Happy Pi Day! Where Did Pi Come From

Happy Pi Day! Where Did Pi Come From?

Pi is present in everyday life. Here is a timeline of the use of Pi dating back to 2000 B.C. Hang this up in your classroom!

Print Infographic

e-Cards

Send a Pi Day e-Card

Celebrate Pi Day by sending one of our e-Cards to your teachers, friends and family.

View E-Cards

Fun Facts About Pi

Fun Facts About Pi

Learn some fun facts about Pi.

Print Factsheet

Pi Day Quiz

Pi Day Quiz

Quiz your students on Pi with these six questions.

Print Quiz

What is Pi?

What is Pi?

Watch this video about the history of Pi and its use in the real world.

Watch Video

Bake a Pi?

Bake a "Pi"

Bake a pie with your family and bring it into school for your math and science teacher to thank them for all they have taught you about Pi! Share a picture of your pie creations on social media with #piday.

Apple Pie recipes from Betty Crocker

Share Your Pi

Share Your Pi

Have you designed a cool T-shirt for Pi Day, come up with a great classroom activity, baked a pie with your child or discovered how Pi is in the world around you?

Share your content with us on social media using #piday.

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Published: 03/07/2016

Last Updated: 03/13/2017

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