Pi Day, celebrated every year on March 14, honors the mathematical constant pi (π), which represents the ratio of a circle’s circumference to its diameter. This day is not only a tribute to math enthusiasts but also a wonderful opportunity for food lovers in Chicago to enjoy amazing deals on both sweet and savory pies.

Understanding Pi Day

Originating in 1988, Pi Day was established by physicist Larry Shaw at the Exploratorium, a science museum in San Francisco. Shaw chose March 14 (3.14) to commemorate the digits of pi (3.14159…) during a staff retreat, aiming to create a fun atmosphere within the museum community.

The inaugural celebration featured fruit pies served at 1:59 p.m., with the tradition evolving over the years to include various festivities such as parades and the memorable ritual of celebrating Albert Einstein’s birthday, which coincidentally falls on the same day.

In 2009, the U.S. House of Representatives officially recognized Pi Day, honoring its significance in popular culture.

As a mathematical constant, pi is essential and appears in numerous fields ranging from architecture to astronomy. The relentless efforts of ancient mathematicians, such as Archimedes, have led to countless calculations of pi, now exceeding over one trillion decimal places. The term itself is derived from the Greek word “perimetros,” meaning “circumference.”

On this day, many eateries across Chicago come together, offering distinctive deals to celebrate the occasion, melding math with deliciousness.

Exciting Pi Day Deals in Chicago

Pizzeria Due

Pizzeria Due is starting the celebrations with a deal for a 10-inch thin crust cheese or pepperoni pizza for just $3.14 for dine-in or takeout. Customers can also enjoy a second deep-dish pizza for the same price when ordered for takeout.

First Slice Pie Cafe

At its three locations — Ravenswood, Andersonville, and Edgewater — First Slice is selling pie slices for $3.14 on Pi Day and offering mini pies for $6.28 or a discount of 15% off whole pies throughout the day.

California Pizza Kitchen

California Pizza Kitchen will delight rewards members with a $3.14 pizza option at participating Chicago locations, featuring favorites like BBQ Chicken, Pepperoni, or Traditional Cheese.

7-Eleven

Convenience chain 7-Eleven joins the festivities with $3.14 whole pizzas, quesadillas, and chicken tender boxes available at selected locations throughout Chicago.

Burger King

Customers who make a purchase of $3.14 or more at Burger King will receive a free Hershey’s chocolate pie as part of their Pi Day celebration.

Gino’s East

Gino’s East in downtown Chicago is giving back by donating $1 to the Greater Chicago Food Depository for every pizza sold on this special day.

Bang Bang! Pie and Biscuits

Bang Bang Pie Shop will unveil a special Pi Day menu that features 15 unique pie flavors, including Chocolate Cake Shake and Chicken Pot Pi(e), creating a delightful selection for all taste buds.

Bennison’s Bakery

In Evanston, Bennison’s Bakery will showcase mini pies for just $3.14 all day at their Davis Street location.

Chiya Chai

Both locations of Chiya Chai will offer diners a $3.14 discount on every pie purchase, making for an enticing culinary experience.