National Pi Day (March 14)
National Pi Day lands on March 14, because 3/14 looks like 3.14, and mathematicians love a good number joke.
It celebrates pi, the irrational number that refuses to end and somehow holds circles together.
Yes, it’s technically about math.
But it’s also about pie. Which helps.
When is the Holiday?
It falls on March 14 every year (3/14). Some math fans even celebrate at 1:59 to sneak in the next digits.
Who Invented It?
Pi Day started in 1988 at the Exploratorium in San Francisco.
A physicist named Larry Shaw decided pi deserved its own celebration, so he handed out fruit pies at 1:59 PM.
It was nerdy. It was wholesome. It stuck.
The History of the Holiday
Humans have known about pi for a long time. Ancient Egyptians and Babylonians used rough versions of it in construction thousands of years ago.
Archimedes refined the calculations. Later mathematicians kept pushing it further.
The Greek letter π didn’t show up until the 1700s, and Leonhard Euler helped make it standard.
By 2009, the U.S. Congress officially recognized Pi Day.
That’s a long journey for a number that never actually finishes.
Fun Pi Day Facts
- Pi is irrational. It never repeats and never ends. Mathematically impressive. Slightly annoying.
- March 14 is also Albert Einstein’s birthday. Coincidence, but a very on-theme one.
- July 22 (22/7) is sometimes called Pi Approximation Day for people who prefer fractions.
- The record for memorizing pi is over 70,000 digits. That’s commitment.
- NASA uses pi constantly in space calculations. Circles don’t stop mattering just because you leave Earth.
Coloring Page
After exploring the fun side of pi, kids can take a break and enjoy this Pi Day coloring page inspired by math and pie.
Activities to Celebrate
You could do a Pi Day scavenger hunt and look for anything starting with those two letters, pencils, pinecones, pizza, pie pans. It gets competitive faster than expected.
Or bake something round and call it math.
Memorizing digits turns into a surprisingly intense contest in some households.
Pi Day worksheets and circle-themed puzzles are easy wins if you’re in classroom mode.
Related Recipes for the Holiday
If you’re leaning into the pie side of Pi Day:
- Pumpkin Pi Cookies – Cut sugar cookies into the pi symbol and flavor them with pumpkin spice. They don’t have to be precise. Slightly uneven actually feels on theme.
- Classic Apple Pie – If you’re going to celebrate pi, a real pie makes sense. Cinnamon apples, flaky crust, done. Ice cream optional but strongly encouraged.
- Pizza Pi – Round dough. Call it math. Add whatever toppings you want and pretend the geometry matters.
- Mini Muffin Tin Salted Caramel Apple Pie Bites – All the apple pie flavor without committing to slicing and serving. Easier. Less cleanup. Still counts.
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Links to Resources
- If you’re into wearable math jokes, Pi Day shirts exist. Some are clever. Some lean fully nerd.
- A great accessory for math lovers, these PI Day wristbands make a fun and educational gift for students and teachers alike.
- Happy Pi Day to You! All About Measuring Circles. A fantastic children’s book that introduces the concept of pi through engaging storytelling and illustrations.
- Step-by-step tutorials for making Pi Day bracelets, bookmarks, and other creative projects.
Related Holidays
- Space Exploration Day (July 20) celebrates major milestones in space travel and the curiosity that drives scientific discovery.
- Pi Approximation Day (July 22) is another math-themed celebration, based on the fraction 22/7, which is commonly used to estimate the value of pi.
- National Blueberry Pie Day (April 28) celebrates one of the most popular pie flavors, making it a sweet excuse to bake, share, and enjoy homemade or bakery treats.
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