🥧 Pi Day
March 14 Grades K–5
Pi Day, March 14 (3/14), celebrates π, the number you get when you divide any circle’s distance around by its distance across: about 3.14.
📅 Next dates
- Saturday, March 14, 2026
- Sunday, March 14, 2027
- Tuesday, March 14, 2028
📖 The story
Pi never ends and never repeats: 3.14159265… Computers have calculated trillions of digits! Ancient Babylonians and Egyptians already knew it was a little more than 3.
Physicist Larry Shaw started Pi Day at the San Francisco Exploratorium in 1988. In 2009 the US House of Representatives made it official. Fun fact: Albert Einstein was born on Pi Day!
✨ Traditions
- Eating pie
- Pi-digit memory contests
- Circle measuring
✂️ Activities
Find Pi Yourself
- Find round things: a plate, a can, a lid.
- Measure around each one with string, then measure across.
- Divide around ÷ across. You should get close to 3.14!
Pi Day quiz
Why is Pi Day on March 14?
About what is pi?
Which famous scientist was born on Pi Day?
Does pi ever end?
💭 Let’s write
Where do you see circles every day?
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