Pi Day has rolled around every year since 1988 in celebration of the mathematical constant, π. The first three numbers of the equation are 3.14, which is why the nationally acknowledged day is always on March 14. Deals are already out for pizza pies and pastry pies. You can take advantage of both for dinner and dessert.

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