Next: 14 Mar 2027
Pi Day
The date 3/14 matches the first digits of pi, so people eat pie.
What is eaten for Pi Day
Pi Day is kept on 14 March because the date written the American way, 3/14, gives the first three digits of pi. It began at the Exploratorium in San Francisco in 1988, where staff walked in a circle and ate fruit pies. Schools, offices and bakeries have since taken it up. The custom is simple: eat something round that is called a pie. Apple pie is the usual choice, and pizza counts.
The dishes
Written by the Thali desk with AI assistance. Background: "Pi Day" on Wikipedia. Customs differ from family to family and place to place. If this is your tradition and we have it wrong, tell us.
Photo credits on this page
The small pictures above come from Wikimedia Commons under free licences. Some are cropped to fit.
- Neapolitan pizza: Valerio Capello at English Wikipedia, CC BY-SA 3.0, source
- Pie: Peggy Greb, Public domain, source
- Key lime pie: Peter Veldhuizen, Public domain, source
- Apple pie: Dan Parsons, CC BY-SA 2.0, source
