National Pi Day is celebrated every March 14. While it is a time to honor the mathematical constant of the ratio of a circle's circumference to its diameter, Pi Day has also come to be known for great food deals.

Just like every year, many restaurants across the country are offering freebies and discounts on pizzas, pies and more food and drinks for National Pi Day.

Here's a list of places where you can score good deals on pizzas and pies this Sunday, per Mashed.com and Patch.com:

BJ's Restaurant

On Pi Day 2021, customers can use the promo code HALFOFF during checkout to get 50% off any large pizza. This deal is available for takeout and delivery.

Cafe Gratitude

Customers will be able to enjoy slices of plant-based pies at any of Cafe Gratitude's three branches in Greater L.A. (Arts District, Venice and Larchmont). For those in the area, choose from vegan "I AM Awakening Key Lime Pie" or "I AM Harmonious Apple Pie" -- single slices ($10) and mini sizes ($13). There is also the vegan-friendly "I AM Giving Margherita" or Hawaiian Pizza for those who don't want something sweet. Those interested can order here.

Marie Callender's

For just $39.95, customers can get four mini pot pies to-go as part of Marie Callender's "Family Feast" special. You can choose between chicken or shepherd's, and these come with salad and cornbread. Price and participation vary per branch.

7-Eleven

Yes, 7-Eleven is once more participating in the annual Pi Day celebration. This year, participating stores are serving up large pizzas for $3.14 on Sunday. The Pi Day deal is available through the 7Rewards loyalty program in the 7-Eleven app.

Your Pie

What is Pi Day if it isn't celebrated by Your Pie? The store will offer Your Pie rewards members $3.14 off any 10-inch pizza from March 14 to 16. Rewards members can claim the deal in-store or online.

Patxi's

Customers can avail of a 7-inch "Personal Cheese" pizza from Patxi's for only $3.14 using the code PIDAY314. This deal is available online, dine-in or takeout.

It should be noted that Patxi's deal is not available through third-party vendors.

Mountain Mike's

Customers who use the promo code PIZZA314 will get $3.14 off a large pizza this Sunday at Mountain Mike's.

Du-Par's

The Pie Shop at The Original Farmers Market is offering customers freshly-baked pies at $3.14 per slice and $13.14 per pie. Customers will have the option to choose from a wide variety of flavors, including apple, cherry, blueberry, pecan and banana cream.

Boston Market

Boston Market's $6.99 pot pies are getting a discount for National Pi Day and will be available for only $3.14 this Sunday. As if that wasn't enough, the eatery's pot pies are also served with cornbread.

A Malaysian family made their own oven to roll out a few dozen pizzas in time for the holy month of Ramadan in April in the Muslim-majority country
A Malaysian family made their own oven to roll out a few dozen pizzas in time for the holy month of Ramadan in April in the Muslim-majority country AFP / MOHD RASFAN
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