National Pi Day Is Here And So Many Chains Are Giving Away Entire Pizza Pies For Just $3.14

National Pi Day falls on March 14, in honor of the mathematical constant that starts with 3.14. Whether you consider yourself a mathematician or not, you can celebrate the day by taking advantage of the many pizza pi(e) deals out there. Places like Papa John's and DiGiorno are giving out pies for just $3.14, or are hosting contests so you can win free pizzas. If you'd rather DIY pizza for Pi Day, be sure to check out our homemade pizza recipes.