March 14th is the one day of the year that we celebrate mathematical constant π (pi). There are many ways to celebrate this day. You can bake pie in the shape of Pi or just cash in on the savings we’ve rounded up below.
- Free Pi Day T-Shirt w/ code YIPPEEPIYAY | ThinkGeek
- Free shipping sitewide w/ no minimum purchase | Uniqlo
- 3.14 years of Free pizza to the person who can solve any of these 3 math problems | Pizza Hut
- $3.14 pizzas all day at locations nationwide | Blaze Pizza
- 25% off menu priced items with code 25OFF | Papa Johns
- 2 medium 2 topping pizzas for $5.99 each with code 9193 | Domino’s
- Free PiZookie desert with food purchases of $10 | BJs Restaurant
- $3.14 off sweet pies and $2 off take and bake pizzas | Whole Foods
- An artistic approximation of Pi T-shirt $19.99 | ThinkGeek
- Pi Day 2016 3.14.16 Round It Up Math Graph STEM T-Shirt $18 (Orig. $26) | Amazon
- A Totally Irrational Tie $19.99 | ThinkGeek
- Raspberry Pi up to 25% off | Amazon
- Pi Symbol Ice Cube Tray $9.99 | ThinkGeek
- up to 30% off sitewide w/ code ACTFAST | ThinkGeek
- Pi Pie Pan $24.99 | Amazon
Pi Day has been observed in many ways, including eating pie, throwing pies and discussing the significance of the number π, due to a pun based on the words “pi” and “pie” being homophones in English, as well as pies tending to be round, and thus related to π.
Massachusetts Institute of Technology has often mailed its application decision letters to prospective students for delivery on Pi Day. Starting in 2012, MIT has announced it will post those decisions (privately) online on Pi Day at exactly 6:28 pm, which they have called “Tau Time”, to honor the rival numbers pi and tau equally. In 2015, the regular decisions were put online at 9:26 AM, following that year’s “pi moment”.
The town of Princeton, New Jersey, hosts numerous events in a combined celebration of Pi Day and Albert Einstein’s birthday, which is also March 14. Einstein lived in Princeton for more than twenty years while working at the Institute for Advanced Study. In addition to pie eating and recitation contests, there is an annual Einstein look-alike contest.