We all know what pie is, but what the heck is pi? Pi ― 3.14 ― is the ratio of the circumference of a circle (the distance around the outside of it) to the diameter of that circle (the distance edge-to-edge). As we may have learned in math class, no matter the size of the circle, pi is always 3.14.

Hence on March 14, many bakeries and eateries in and around Milwaukee are offering pie sales and diverse pie selections. A selection of them are listed below.

Note that pie availability is typically while supplies last and preordering or calling beforehand is recommended. If there is a bakery or restaurant that is recognizing Pi Day and is not included in this list, let us know so we can add it.

Gather Bakehouse in Bay View

At Gather Bakehouse, the bakery will have mini 3-inch pies as well as 9-inch pies. Flavors include Dutch apple, strawberry rhubarb, cherry, French silk, honey custard and key lime. There will also be preorder options.

Location: 1100 E. Oklahoma Ave., Milwaukee

Hours: 6 a.m. to 3 p.m. Tuesday through Friday; 7 a.m. to 3 p.m. Saturday and Sunday. It’s closed on Monday.

For more information: Visit gatherbakehouse.com

National Bakery & Deli in Brookfield, Greendale and Milwaukee

National Bakery & Deli will have multiple pies available for National Pi Day: banana cream, cherry, apple, chocolate cream, Dutch apple and strawberry cream.

Location: 13820 W. Greenfield Ave., Brookfield; 5637 Broad St., Greendale; and 3200 S. 16th St., Milwaukee.

Hours for all locations: 6:30 a.m. to 3 p.m. Monday through Friday; and 6:30 a.m. to 2 p.m. on Saturday.

For more information or to order online: Visit nationalbakery.com

Kelly’s Pot Pies & More in Greenfield and East Troy

Kelly’s Pot Pies & More will have $3.14 off any large Reuben pot pie or shepherd’s pie beginning Pi Day and running through St. Patrick’s Day. These specials will be at both the East Troy and Greenfield stores.

Kelly’s Pot Pies & More also has other pot pies, including beef, turkey, veggie, taco and pizza. They also offer quiche, cheesecake, lemon torte and key lime pie.

To help guarantee a pie, order online two hours or more in advance.

Locations: 3785 S. 108th St. in Greenfield; and 3268 Main St. in East Troy

Hours: 11 a.m. to 5:30 p.m. Tuesday through Friday; and 10 a.m. to 2 p.m. Saturday

To order online or for more information: Visit kellyspotpies.com.

Mr. Dye’s Pies at 3rd Street Market Hall in Milwaukee

At Mr. Dye’s Pies at 3rd Street Market Hall, there are a plethora of pies sold by the slice or as a whole pie including peanut butter, sweet potato, pecan, key lime and blueberry.Location: 5504 W. State St. (First Floor, South Hall located in the row of stalls to the right of Dairyland)

Hours: 11 a.m. to 8 p.m. Tuesday through Thursday; 11 a.m. to 10 p.m. Friday and Saturday; and 11 a.m. to 7 p.m. on Sunday

For more information: Visit 3rdstmarkethall.com/locations/all-vendors/mrdyespies

More: Milwaukee-area bakers offer tips for making the perfect pie crust

The Elegant Farmer in Mukwonago

The Elegant Farmer will participate on National Pi Day from March 9 to 15 and will offer $3.14 off 5-inch apple pies baked in a paper bag (original price is $9.99). The pies baked in a bag feature a flaky crust with a sugar cookie-like top. 

Location: 1545 Main St. (at Highways ES & J) in Mukwonago

Hours: 9 a.m. to 6 p.m. daily

For more information or to order: Order online at elegantfarmer.com or call 262-363-6770

Periwinkle’s Bakery in Waukesha

Periwinkle’s Bakery on Broadway in Waukesha will have its full pie menu for special order on March 14 and a variety of 9-inch-deep dish pies for sale that same day at its retail location at neighboring Rochester Deli. These include French Silk, caramel apple, Key West lime, wild blueberry and peanut butter French silk.

Online orders need to be placed the week prior.

Location: 143 W. Broadway, Waukesha (Bakery for purchase inside of Rochester Deli)

Hours: 10 a.m. to 3 p.m. Monday through Thursday; 10 a.m. to 7:30 p.m. Friday; and 10 a.m. to 3 p.m. on Saturday

For more information: Visit periwinklesbakery.com

All in Favor, Say Pie in Waukesha

At All in Favor, Say Pie, you can order your pie online to pick up in Waukesha. Flavors include Door County cherry pie, apple blueberry, Dutch apple pie, cranberry apple, mixed berry and blueberry. Pies should be ordered two to five days in advance.