The sign at a Pizza Hut location, which is owned by Yum Brands Inc., is pictured in Pasadena, California, July 11, 2016. Reuters

Math, pizza and pastry lovers can rejoice — March 14 is Pi Day.

While March 14 (3/14) is the annual event that celebrates the mathematical constant and the ratio of a circle’s circumference to its diameter, restaurants and brands use the day — quite literally — to promote “pie.” Every year, more and more companies announce Pi Day deals on items like pizzas and dessert pies.

Pizza deals reign supreme on 3/14 (because who doesn’t love pizza?). While you might be inclined to snap up the day’s remaining pizza promotions, it might be best to do a little math ahead of time — in true Pi Day fashion. While calorie counts vary with pizza toppings and recipes, a slice of cheese pizza (weighing about 103 grams) is around 272 calories, according to LiveStrong.com. A calorie counting website averaged a slice of cheese pizza at nearly 250 calories.

Indulge wisely and check out these eight pizza deals for Pi Day.

Read: The Best Pi Day Jokes

Villa Italian Kitchen: Customers can get a Neapolitan cheese pizza for $3.14 with a coupon. The offer is available at various locations.

Hungry Howie’s: Medium, one-topping pizzas will be available for $3.14 with the purchase of bread. The offer stands at most U.S. locations, except in Florida.

Timber Pizza Co.: With the purchase of a pizza, wine and beer will be priced at $3.14.

Pizza Hut: Large, two-topping pizzas ordered online will be priced at $7.99 through the month.

Blaze Pizza: Any pizza at any one of this restaurant's locations nationwide will be available for $3.14.

Domino’s: Buy one pizza at menu price and get one of equal or lesser value free through March 19 with a coupon.

Papa John’s: Shoppers can purchase a large two-topping pizza or pan pizza for $9.99.

Urban Bricks Pizza Co.: All of this company’s locations will be offering pizzas for $3.14.