Pi Day 2023 deals: For the love of math, snag discounted pizza at these Phoenix restaurants

Tuesday equals deals on pizza pies.

March 14 marks Pi Day, the annual holiday in honor of the mathematical constant π (pi), the ratio of a circle's circumference to its diameter.

The irrational number is typically rounded down to 3.14 hence why the celebration takes place on March 14, which has a numerical date of 3/14. The date also happens to be famed physicist Albert Einstein's birthday and marks the anniversary of Stephen Hawking's death.

While the day is really about math, many restaurants offer deals and discounts on circular food, including pizza and traditional dessert pies, to celebrate the holiday.

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Why is Pi Day celebrated on March 14?

In 1988, Larry Shaw, a former staff physicist at the Exploratorium museum in San Francisco, linked March 14 (3/14) with the digits of pi (3.14) and celebrated the first Pi Day with fruit pies and tea. Shaw led Pi Day parades yearly at the museum until his death in 2017, according to the Exploratorium.

Pi Day became an annual tradition at the Exploratorium, and the celebration became an official U.S. national holiday in 2009. The U.S. House of Representativesresolution that designated Pi Day aims to encourage "schools and educators to observe the day with appropriate activities that teach students about Pi and engage them about the study of mathematics."

Whether you're a math lover or a food lover (or both), here are some tasty deals you can snag on Pi Day. The offers are only available Tuesday unless otherwise noted, and make sure to check if your nearest location is participating before heading out.

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Free pocket pies at MOD Pizza

On Pi Day, MOD Pizza is giving customers the opportunity to try MOD’s new Pocket Pie for free. Customers simply need to give secret code (hint π).

Made from MOD’s signature 6-inch mini pizza crust, the calzones come in three flavors: Italiano: A white sauce base packed with shredded mozzarella and parmesan cheese, pepperoni, salami, roasted red peppers, sliced tomatoes, fresh basil and arugula and red sauce. Four Cheese is filled with freshly shredded mild-cheddar, mozzarella, asiago and parmesan cheese. And Chicken Bacon Ranch is filled with shredded mild-cheddar cheese, chicken, bacon, and finished with a ranch drizzle.

Sauce Pizza & Wine offering Cheese Pizzas for $3.14

Sauce Pizza & Wine is celebrating Pi Day with $3.14 Cheese Pizzas on Tuesday, March 14th.

There are no strings attached with this deal. Guests simply order a cheese pizza at any location and receive the special offer. Additional toppings and specialty pizzas are extra.

There is a limit of two Pi Day pizzas per check. It is valid for dine-in, takeout and online ordering.

7-Eleven has pizza for $3.14

7Rewards and Speedy Rewards members can get any whole pizza for $3.14 at participating 7-Eleven, Speedway and Stripes locations.

The offer is limited to two pizzas per customer.

Members can also redeem the deal via the 7NOW Delivery app.

Blaze brings back Pi Day pizza promo

Blaze Pizza is offering diners any one 11-inch pizza for $3.14 (not including crust upgrades) when they download the Blaze app and join Blaze Rewards.

The offer is available in-restaurant and varies based on location.

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Jet's Pizza offers discount

Jet's Pizza customers who order online can get 20% off all menu-priced pizzas with the code 314DAY.

The offer is available for both pick-up and delivery.

Marco’s has a deal on a medium pizza

Marco's Pizza customers who buy any large or extra-large pizza at the regular menu price can get a medium one-topping pizza for only $3.14.

Pizza lovers can order online or through the Marco's Pizza app using the code PIDAY2023.

Papa Johns has a Pi Day BOGO

Papa Johns customers can buy one large one-topping pizza for the regular menu price and get a second large one-topping pizza for $3.14 with the promo code PIDAY.

Round Table Pizza offers cheesy deal

Round Table Pizza Royal Rewards members can snag personal cheese pizzas for $3.14.

The offer is valid only at participating locations.

Schlotzsky's has a BOGO offer

Schlotzsky's reward members can buy one pizza and get another for free at participating locations.

The offer excludes kid's pizzas, and the free pizza must be of equal or lesser value.

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This article originally appeared on Arizona Republic: Pi Day 2023 deals: Phoenix restaurants offer free, discounted pizza