Pi Day deals are here: Where to get $3.14 pizza, pie savings, plus McDonald’s, Wendy’s offers

It’s not irrational to find deals including pizza for $3.14 this Monday.

March 14 is Pi Day, the annual celebration of the mathematical constant π (pi), which is the ratio of a circle's circumference to its diameter. The trillion-digit ratio is rounded to 3.14.

Albert Einstein was born on Pi Day and noted astrophysicist Stephen Hawking died on the made-up holiday in 2018.

But you don't have to be a math scholar to be acutely aware that Pi Day equals deals on circular food, including pies and pastries.

Pi Day, not to be confused with National Pie Day held in January or National Pizza Day in February, is usually a smorgasbord of deals on pizza, pastries and pot pies.

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Pi Day freebies, deals and $3.14 pizza

Here are the deals available at participating locations Monday, unless otherwise noted. To be on the safe side, always check with your closest location before heading out. Many deals require you to have a restaurant's app or be signed up for emails.

7-Eleven Pi Day pizza deal

7-Eleven will have a $3.14 pizza deal Monday for members of its 7Rewards loyalty program. Get any whole pizza for $3.14, including cheese, pepperoni or 7-Meat at participating 7-Eleven and Speedway stores. At participating Speedway stores, get the deal with the Speedy Rewards loyalty program.

The Pi Day pizza deal also is available for $3.14 through the 7NOW delivery app.

There's a limit of two pizzas per rewards member in-store and two pizza deals for delivery. Fees and delivery charges apply.

BJ’s Pi Day $3.14 pizza deal

BJ’s Restaurant & Brewhouse has a dine-in pizza deal for Pi Day. Get a mini one-topping pizza for $3.14 Monday.

Blaze Pi Day deal: Pizza for $3.14

Blaze Pizza is giving new and existing Blaze Rewards members any 11-inch pizza for $3.14 with a one-time reward on the chain's app. To get the deal you need to sign up for the loyalty program on the app by the end of the day Monday. The reward can be redeemed Monday through March 31.

Crust upgrades are extra and there is a limit of one Pi Day reward per user.

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Carnation Pi Day online giveaway

Carnation is giving fans a chance to win "Cow Pies," which feature Carnation Evaporated Milk, cocoa and more through Monday. Ten people will win the prize worth $20 each, according to the contest fine print. Enter at Play.keeplifedelicious.com/Carnation-pie-day.

Chuck E. Cheese Pi Day and spring deal

Chuck E. Cheese said its Spring-tastic Family Fun Pack is available for Pi Day and through April 24 for delivery or carryout. For $34.99, get two large pizzas, Unicorn Cotton Candy, a goody bag and spring activity sheet, and 250 e-tickets for your next Chuck E. Cheese visit.

Cicis Pi Day deal: $3.14 adult buffet

Cicis Pizza has all-you-can-eat pizza for $3.14 on Monday. The $3.14 adult buffet offer is available for dine-in at Cicis locations nationwide.

The chain also has a pizza deal for takeout. Get two, large one-topping pizzas for $5.99 each.

Domino's Pi Day: $3 coupon for carryout orders

For a limited time, Domino's will give you a $3 "tip" to order your pizza online and pick it up yourself instead of choosing delivery.

Make a carryout order through May 22 and get a $3 coupon code to redeem the following week on a carryout order of $5 or more before tax and gratuity.

Also, earn points to redeem for free pizza with the chain's Piece of the Pie rewards program that you can sign up for at Dominos.com.

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Donatos Pi Day deal: $3.14 off large pizza

Donatos Pizza has a deal Monday for Pi Day. Get $3.14 off any large pizza when you order online with code PI.

Eggo free waffles for daylight savings transition Monday 

Eggo is giving away 100,000 free boxes of waffles to make the daylight savings transition easier. 

The Kellogg’s brand said on Monday it will announce official instructions on its social media accounts Monday and the first 100,000 people to sign up will receive one free box of 10 count Homestyle waffles.

Learn more at Leggowitheggo.com.

El Torito margaritas for $3.14

El Torito, a chain with 74 locations, is offering house margaritas for $3.14 all day Monday.

Honey Baked Ham Pi Day coupon

The Honey Baked Ham Company has a printable coupon for $3.14 off the Apple Caramel Walnut Pie on Monday. The coupon is required and the brand says it must be printed and brought in store or code can be used online for pick-up. Locations that will not accept the deal are listed on the coupon website.

Hungry Howie’s Pi Day deal

Hungry Howie’s is offering 40% off any pizza from Sunday through March 20 with promo code FORTY. The deal is for online carryout orders at participating locations.

Marco’s Pi Day BOGO deal

Marco’s Pizza has a buy-one-get-one deal Monday. Purchase any large or x-large pizza at menu price and get a medium one-topping pizza for $3.14. Order online or through the chain’s app with code PIDAY2022.

McDonald’s Pi Day free pie deal

Get a free pie Monday with $1 or more purchase and a McDonald’s app deal.

McDonald's also has several ongoing deals on its app and with the MyMcDonald's Rewards program. Offers and daily deals can vary by account and region.

Don't have the app? McDonald's says on its website that you'll get a free large fries when you download the app and join MyMcDonald’s Rewards through March 31. Then after your first purchase, you get the choice of Hash Browns, Vanilla Cone, McChicken or a Cheeseburger for free.

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Papa Gino's Pi Day code

Get 25% off online pizzas at Papa Gino's Monday with code 9044.

Pieology Pi Day double rewards points

Pieology has a “Free Pizza Friday” promotion on social media Fridays in March. On March 11, it will give away three free pizzas and then 14 free pizzas Monday. To enter, guests must comment how many toppings they like on their pizza and Pieology will pick the three and 14 winners on Monday at 5 p.m. PST.

Then on Pi Day, Pieology will be celebrating with double the points for Pie Life Reward members who download the app and join the chain's "circle of family, friends and community."

Round Table Pizza Pi Day deal

Round Table Pizza is celebrating Pi Day with an offer for a $3.14 Personal Cheese Pizza Monday. The deal is available to new and existing loyalty members. Access the deal on the Round Table Pizza Royal Reward App.

Slice Pi Day deal

Slice, the pizza delivery app with over 17,000 local pizza shops nationwide, is offering $5 off pizza orders $15 or more for first-time Slice users with promo code PIDAY2022.

Taco Bell Pi Day deal: 50-cent coffee

Taco Bell has a deal on its new Cinnabon Delight Coffee through Thursday. Get a cup for 50 cents with a $1 or more purchase at breakfast from open until 11 a.m. The offer is “redeemable only via the Taco Bell mobile app for in-store/drive-thru pickup orders, at participating U.S. Taco Bell locations, while supplies last,” according to the fine print. 

Wendy’s Pi Day and March Madness deals

Wendy’s has several deals on its mobile app for a limited time. The chain says it is the “Official Breakfast” and the “Official Hamburger” of March Madness.

Deals include:

• $1 Dave’s Single: Through April 10, Wendy’s will have singles for $1 via mobile order on the app. The deal will refresh daily.
• Half-off breakfast: Get half off your entire Wendy’s breakfast purchase when ordered in the app with mobile order through March 31.  The deal refreshes daily.
• $3 off orders of $15 or more: Get $3 off any order of $15 or more through the Wendy’s app through April 10. The deal will be refreshed daily.
• BOGO $1 premium chicken sandwich: This deal will refresh weekly. Buy one premium chicken sandwich and get a second for $1 through April 10 with a mobile offer.

White Castle Pi Day free food

White Castle is giving away free dessert-on-a-stick with any purchase Monday with a coupon. 

Whole Foods Pi Day deal: $3.14 off pies

Amazon Prime members get $3.14 off large cherry and apple pies at Whole Foods Market bakeries Monday. This deal is in-store only and excludes all other pie flavors, brands and sizes. While supplies last.

Your Pie Pi Day pizza deal

New and existing Your Pie Rewards members will get an offer for $3.14 off one 10-inch pizza to redeem in-store or online Monday through March 16. The offer is redeemable on one pizza per guest, per order and exclusions apply, the chain said. 

To get this deal, you need to sign up for the loyalty program before Monday, Your Pie said. Learn more at Yourpie.com/pieday.

Follow USA TODAY reporter Kelly Tyko on Twitter: @KellyTyko. For shopping news, tips and deals, join us on our Shopping Ninjas Facebook group.