White Castle: With a coupon, get a Breakfast Slider combo for $3.14.
Kneaders Bakery, 1821 N. Rock Road: Offering $1.50 slices of pie with purchase on Thursday.
Marie Callender's: Get a free slice of pie at Marie Callender's with the purchase of an adult entree.
Fresh Brothers: Grab a personal pizza with unlimited toppings for $3.14 at Fresh Brothers in Carmel Valley, using the promo code "PIDAY". The promotion runs both March 13 and March 14.
For those who don't like pie very much, it also happens to be National Potato Chip Day.
On Pi Day only, you can purchase one Adult Buffet meal and large drink to get another Adult Buffet meal for $3.14-get the coupon here.
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Every Pi Day, my brother-in-law, a PhD math/physics guru, posts an endearingly nerdy treatise about pi on Facebook. There will also be a cheese-pulling photo contest on Instagram for the chance to win a $50 gift card by using the #perfectpieologypull hashtag.
The Village Inn will offer $2 off any whole pie today in honor of Pi Day, but only in restaurants and at participating locations.
Whole Foods throughout Bay Area: Large pies will be selling for $3.14 less.
Download the Blaze Pizza app and redeem the offer in-restaurant on Thursday.
Revealing the news on social media, PI explain "March 14th is known as "Pi Day".
Kroger - The grocery store chain is offering select fruit-filled pies - including apple, cherry, peach and pumpkin - for just $3.14.
Blaze Pizza: The chain's smartphone app is needed to get the $3.14 Pi Day deal Thursday on custom pizzas. Chef and owner John Park gives back 10 percent of the restaurants profits to local OC charities.