Pi Day is Coming! Fun 3.14 T-Shirts For Math Nerds

We celebrate Pi Day each year on March 14, because 3.14 are the first digits in Pi. Pi is a mathematical constant that represents the ratio of a circle's circumference to its diameter. Pi is actually an irrational number, meaning it is an unending, patternless decimal. 

Pi is often shown as the Greek letter π. The symbol is used to make fun "pie" puns and jokes, especially in memes and, of course, on novelty t-shirts. Here are some fun Pi t-shirts that would be a great choice to wear on Pi day or any time you want to share your geeky math love.

Funny Irrational Pi Math Geek T-Shirt

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This is a great text Pi Day t-shirt with a funny slogan for math nerds. The full slogan reads "They Call Me PI Because I'm Irrational and I Don't Know When To Stop". The arrangement of the different mashup fonts is fun and playful. The white text with blue highlights pops against the black t-shirt (also available in other dark colors).

Captain America Logo Gets Pi Treatment

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This is a patriotic Pi Day t-shirt design for math geeks. The first digits of PI are arranged in circles around the Greek letter. The red, white, and blue colors are arranged in the familiar style of Captain America's famous shield.

Silly Pi = Pie Text & Graphic T-Shirt

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Pi is to Pie what π is to a cartoon image of a pie. This funny graphic Pi shirt takes the play on words and adds in pie humor. This funny t-shirt is available in sizes Small to 3XL.

Birds Meet Math: Cute Cartoon Mag-PI Shirt

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Here the word PI, represented by the Greek letter π, helps spell out the name of a bird: the Magpie (or MagPI). The cute stylized name is accompanied by a cartoon image of a Magpie bird. This is a fun cartoon Pi Day t-shirt for math geeks who are also bird lovers!

Funny Yummy Pi T-Shirt

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If the math symbol Greek letter π makes you hungry, this funny simple text Pi Day shirt is for you. A large blue π symbol is accompanied by smaller text above that readsy simply "Mmmm..." as in YUM! Pie!

Root 66 Square Root Funny Math Geek T-Shirt

This t-shirt design looks like a highway route sign. The top of the sign reads ROOT and the bottom shows a square root symbol over the number 4356. The square root of 4356 is 66... so this sign reads "Root 66". This is a funny geek t-shirt...