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Pi Day

Updated on June 29, 2013

Pi Day

Pi Day is an international holiday that is celebrated by the entire world on March 14. The reason Pi Day is celebrated on March is that the first 3 numbers form number 3.14 which can easily be changed to 3/14, or March 14. Pi is an irrational number that goes on forever without end. There are more numbers in Pi than there are people on Earth, so remember infinite numbers of Pi can be very hard. However, people like Daniel Tammet have been able to dictate many digits for Pi. In fact, Tammet dictated over 22,000 Pi digits during the 2004 celebration of another Pi Day. Jump into Pi Today, but you will never see the end of Pi as a number and as a holiday!

Pi Is Like A Vortex

If you are wondering how many digits Pi has, you can think of Pi as a vortex without an end. Somewhat like the cliff at superman's icy location (base), there is no bottom/end in Pi. Based on the picture, Pi also looks like a tornado without a bottom. The main idea is that Pi is an irrational number with a beginning, but no end.

Founder of Pi Day

Larry Shaw, a physicist at San Francisco Exploratorium is the founder of Pi Day. To this day, Pi Day is celebrated in the Exploratorium. The House of Representatives announced Pi Day a national holiday back in 2009. In 2015, Pi Day will begin at 9:26:53 to honor more numbers of Pi which can be represented as 3.141592653... There will never be an end to Pi or its holiday!

Activities for Pi Day

Pi Day celebrates 3.14...., an irrational number. There are some fun activities that you can do during Pi Day! For example, you can have 10 different colors of paper and make a key. So, yellow papers=3 and black papers=1. You can line these papers up for as long as you want to get the number of Pi.

Get plates and put a Pi Sign in the middle. Plates are usually shaped like circles, and eating off of a Pi plate wouldn't hurt!

Make a pie, measure the circumference, diameter, radius, volume, etc. Then you can eat that tasty pie!

Compete with your family members to say the most digits in Pi.

There are also so many more ways to celebrate Pi Day!

Get Prepared for Pi Day

Use these pieces of paper to represent the digits in Pi!


A list of shapes that use Pi

Circle- 2 dimensional

Cylinder- 3 dimensional

Sphere- 3 dimensional

Cone- 3 dimensional

Digits in Pi

For even more Pi digits (100,000), you can click here

Pi can be written as 3.141592653589793238462643383279502884197169399375105820974944592307816406286 208998628034825342117067982148086513282306647093844609550582231725359408128481 117450284102701938521105559644622948954930381964428810975665933446128475648233 786783165271201909145648566923460348610454326648213393607260249141273724587006 606315588174881520920962829254091715364367892590360011330530548820466521384146 951941511609433057270365759591953092186117381932611793105118548074462379962749 567351885752724891227938183011949129833673362440656643086021394946395224737190 702179860943702770539217176293176752384674818467669405132000568127145263560827 785771342757789609173637178721468440901224953430146549585371050792279689258923 542019956112129021960864034418159813629774771309960518707211349999998372978049 951059731732816096318595024459455346908302642522308253344685035261931188171010 003137838752886587533208381420617177669147303598253490428755468731159562863882 353787593751957781857780532171226806613001927876611195909216420198938095257201 065485863278865936153381827968230301952035301852968995773622599413891249721775 283479131515574857242454150695950829533116861727855889075098381754637464939319 255060400927701671139009848824012858361603563707660104710181942955596198946767 837449448255379774726847104047534646208046684259069491293313677028989152104752 162056966024058038150193511253382430035587640247496473263914199272604269922796 782354781636009341721641219924586315030286182974555706749838505494588586926995 690927210797509302955321165344987202755960236480665499119881834797753566369807 426542527862551818417574672890977772793800081647060016145249192173217214772350 141441973568548161361157352552133475741849468438523323907394143334547762416862 518983569485562099219222184272550254256887671790494601653466804988627232791786 085784383827967976681454100953883786360950680064225125205117392984896084128488 626945604241965285022210661186306744278622039194945047123713786960956364371917 287467764657573962413890865832645995813390478027590099465764078951269468398352 595709825822620522489407726719478268482601476990902640136394437455305068203496 252451749399651431429809190659250937221696461515709858387410597885959772975498 930161753928468138268683868942774155991855925245953959431049972524680845987273 644695848653836736222626099124608051243884390451244136549762780797715691435997 700129616089441694868555848406353422072225828488648158456028506016842739452267 467678895252138522549954666727823986456596116354886230577456498035593634568174.......

Pi Day Is Tomorrow!

Pi Day is tomorrow on March 14, 2012 and is an exciting time for all math teachers, students, experts, and people just like you! Pi Day celebrates the irrational number known as Pi that starts off with the first 3 digits, 3.14 which looks like 3/14 on Pi Day! I can't wait for Pi Day, can you?

Happy Pi Day!

Pi Day is among us today on March 14, 2012 (3.14). I can't wait to celebrate by reciting some of the digits of Pi and using pieces of paper to represent the numbers! Today is also Albert Einstein's birthday! Two great events for math put together means a lot of celebration!

Pi Day Is Now Over

But It Will Be Back

That Pi Day was fun. I piled up papers with 10 different colors and got up to 100 digits in Pi. I didn't have pie last year, but I will next year. I love Pi Day and hope that is comes around soon.

Pi Day

Pi Day was created and first celebrated by Larry Shaw. He helped make this wonderful day happen, and this is one of the few math holidays that is celebrated around the world. The universe celebrates Pi because it is part of the Universal Set of Real Numbers. Pi Day is full of activities for teachers, students, and family. Pi Day is an amazing day in which everyone has a fun time.


Since Pi is used to find the area and circumference, I thought it would be a good idea for me to talk about circles.

  • Circles have infinite lines of symmetry.
  • The diameter of a circle is a straight line (180 degrees) that cuts the circle in half.
  • The radius is half of the diameter.
  • There are infinite diameters and radii (plural of radius) in a circle.
  • Circles always measure 360 degrees.
  • Everyday, we will stumble into something with a circle shape, but we might not remember it all the time.


You might need these notebooks for school, or you can write all of the digits of Pi (all that you can write) into these notebooks. Get started today!

Please Help

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What Do You Do During Pi Day? - Or do you just want to give feedback?

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    • Lee Hansen profile image

      Lee Hansen 6 years ago from Vermont

      I love the Pi Day holiday - so much fun for all us Geeks.

    • williemack58 profile image

      williemack58 6 years ago

      I never thought about it, OK cut me a slice.

    • vetochemicals profile image

      Cindy 6 years ago from Pittsburgh Pa

      I didn't know it was Pi day but, now I'm going to go eat a piece of berry pie:) Good lens and info:)

    • WriterJanis2 profile image

      WriterJanis2 6 years ago

      Thanks for explaining the reason for the date of Pi Day. Have a great one!

    • profile image

      julieannbrady 6 years ago

      Hmmm ... I was going to work on my taxes, but instead worked in the yard. Happy PI Day!

    • KimGiancaterino profile image

      KimGiancaterino 6 years ago

      Here's wishing you a Happy Pi Day!

    • sousababy profile image

      sousababy 6 years ago

      I draw circles, cylinders, spheres and ice cream cones that day . . oh and spheres of vanilla ice cream beside pumpkin pi - ha.