March 14 marks National Pi Day, a celebration of the mathematical constant π (3.14) with freebies and deals. Here's what you need to know.

National Pi Day celebrates the mathematical constant "pi." It is celebrated on March 14 because the first three digits are 3.14.

Goldbelly is arguably the go-to place to shop for desserts (and other food) online, and the website has dozens of pies to choose from. This peanut butter fudge pie is from Stockholm Pie & General Store in Wisconsin, and it’s a fan favorite thanks to its rich, indulgent peanut mousse and brownie-like fudge base.

Astro Doughnuts & Fried Chicken: The Shirlington outpost of this doughnut shop hosts a festive mini doughnut decorating event ($15) on Saturday from 10 a.m. to 2 p.m. 4005 Campbell Avenue, Arlington, Virginia

College students, rocket scientists and math enthusiasts around the world are celebrating Pi Day. The holiday on March 14 — or 3/14 — correlates to the first three digits of the infinite number.

Pi Day is March 14. Plenty of restaurants and pizza shops are offering deals for cheap or free pizzas and pies. Even more have deals for $3.14. As you sat in elementary school or junior high and your math teacher began introducing algebraic terms to your vocabulary,

Pi Day is a favorite holiday for both food lovers and mathematicians. For the foodies, the reasoning is simple. Pi Day brings discounts and deals for people looking to grab a pizza to celebrate the holiday.

Pi, defined as the ratio between the circumference of a circle and its diameter, is what's known as an irrational number. Despite its ubiquity, not only across math but also in fields as varied as medicine,

National Pi Day 2025 brings pizza and pie deals nationwide, with discounts like $3.14 pizzas and freebies from major chains.