Pi Day occurs on March 14, because the date is written as 3.14 in the United States. Pi is the ratio of the circumference of a circle to its diameter, or approximately 3.14 (its exact value is infinite and can't be calculated). March 14 also happens to be Albert Einstein's birthday.
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RELATED: What is Pi Day? What to know about the holiday to celebrate math's beloved irrational number
With eating out becoming more of a luxury, restaurants use such deals to help draw customers to fast casual and fast food chains.
Pi Day has also become synonymous with pizza pie (and other round foods) - here are some deals to round out your celebration.
Best Pi Day deals for 2025
Blaze Pizza
Build-your-own-pizza chain Blaze is offering a buy one 11-inch pizza, get another one for $3.14 in-store at participating locations.
BJ's Restaurant & Brewhouse
When dine-in customers at BJ's Restaurant & Brewhouse buy one Pizookie, they can get a second one for $3.14.
California Pizza Kitchen
CPK rewards members can get an Original BBQ chicken, pepperoni, or traditional cheese pizza for $3.14 with a dine-in purchase of $25.
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Taco Bell
Get a Taco Bell Mexican Pizza for just $3.14 on Pi Day 2025.
Pizza Hut
Snag a "Pizza Charcuterie Board" from Pizza Hut on Pi Day. For $24.99, you can customize two medium pizzas, boneless wings, and breadsticks.
This story was originally published in 2024 and has been updated.
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