Math enthusiasts around the world, from college students to rocket scientists, celebrate Pi Day, which is March 14 or 3/14 — the first three digits of an infinite number with many practical uses. Many people will mark the day with a slice of pie — sweet,

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,

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