Pi Day 2026: Where to find $3.14 pizza and pie deals on March 14

Pi Day is shaping up to be a big one for bargain hunters, with pizza chains and fast-food brands rolling out limited-time offers in honor of March 14. 

From $3.14 pies to buy-one-get-one deals and discounted desserts, restaurants across the country are leaning into the math-themed holiday with plenty of ways to celebrate on a budget.

Here are some Pi Day deals:

Big Boy

Big Boy is celebrating Pi Day on March 14 with $3.14 slices of pie, available all day at participating locations. Guests can choose from a variety of classic fruit and cream pies. The dine-in deal is offered while supplies last. Details and locations are available at BigBoy.com.

Blaze Pizza

Blaze Pizza is celebrating Pi Day on March 14 with a special offer: buy one 11-inch pizza and get a second 11-inch pizza of equal or lesser value for $3.14 at participating locations across North America.

Burger King

Burger King is marking Pi Day on March 14 with a sweet deal for customers nationwide. Guests can receive a free HERSHEY’S Sundae Pie or Cinnamon Apple Pie with a minimum purchase of $3.14.

Marco's Pizza 

Marco’s Pizza is marking Pi Day with a value-driven offer designed to add up for customers. For a limited time, the brand is featuring a Medium 1-topping pizza for just $3.14, giving families and pizza lovers an affordable way to join the March 14 celebration.

7-11

7-Eleven is turning Pi Day into a two-day celebration on March 13 and 14, offering 7Rewards and Speedy Rewards members whole pizzas for $3.14, quesadillas for $3.14 at select locations, and cinnamon sugar fried pies for 31.4 cents. The chain is also featuring $1 7-Select snack pies at participating stores.

Polly's Pies

Southern California staple Polly’s Pies is celebrating Pi Day on March 14 with a lineup of sweet deals across its 12 locations. Dine-in guests can receive a free slice of pie with the purchase of any entrée, while Polly’s Perks members can enjoy a free slice—no purchase required.

What is Pi?

Dig deeper:

Pi can calculate the circumference of a circle by measuring the diameter — the distance straight across the circle’s middle — and multiplying that by the 3.14-plus number.

It is considered a constant number and it is also infinite, meaning it is mathematically irrational. Long before computers, historic scientists such as Isaac Newton spent many hours calculating decimal places by hand. Today, using sophisticated computers, researchers have come up with trillions of digits for pi, but there is no end.

What is Pi Day?

The backstory:

Pi Day itself dates to 1988, when physicist Larry Shaw began celebrations at the Exploratorium science museum in San Francisco. The holiday didn’t really gain national recognition until two decades later. In 2009, Congress designated every March 14 to be the big day — in the hopes of spurring more interest in math and science. Fittingly enough, the day is also Albert Einstein’s birthday.

Impact of Pi

Big picture view:

The number is key to accurately pointing an antenna toward a satellite. It helps figure out everything from the size of a massive cylinder needed in refinery equipment to the size of paper rolls used in printers.

Pi is also useful in determining the necessary scale of a tank that serves heating and air conditioning systems in buildings of various sizes.

NASA uses pi on a daily basis. It’s key to calculating orbits, the positions of planets and other celestial bodies, elements of rocket propulsion, spacecraft communication and even the correct deployment of parachutes when a vehicle splashes down on Earth or lands on Mars.

Using just nine digits of pi, scientists can calculate the Earth’s circumference so accurately it errs by only about a quarter of an inch for every 25,000 miles. 

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