Everyone knows what pi is, right?

It’s the ratio of a circle’s circumference to its diameter, expressed as the number 3.14. The long version is 3.14159265358979323846264 et cetera to infinity.

What could be simpler than that?

A good bargain would be simpler.

National chains will offer deals and discounts for National Pi Day, which is held annually on March 14 (3/14).

Call ahead to see if your store is participating, and the offer is only good for online orders.

Hungry Howie’s: Carry out a medium one-topping pizza for $3.14 on March 14.

Blaze Fast Fire’d Pizza: Create your own artisan pizza for $3.14 when dining in with an offer in the free Blaze app. 

Cheddar’s Scratch Kitchen: Buy one chicken pot pie for $8.49 and get another to take home for free. 

7-Eleven: 7Rewards app mebmers get 50 cent pizza slices. Plus order a whole pizza in stores and scan your the app to get 314 bonus pionts. Also, get a whole pizza delivered for $3.14 through 7NOW at Delivery.7-eleven.com/home (the first three deliveries are free).

Publix: Mini Key Lime pie or small apple pies for $3.14.

At California Pizza Kitchen, you can order a $3.14 slice of key lime pie to your dine-in or take-out order.

Papa Murphy’s

Get up to three large thin-crust, one-topping pizzas for $3.14 each on Pi Day at Papa Murphy’s locations that offer the deal.

Call ahead to see if your store is participating, and the offer is only good for online orders.