Pi Day T-Shirts

Wear your Pi Day pride with our fun and geeky t-shirts, showcasing clever algorithms, pi symbols, and humorous math jokes that make celebrating the circle even cooler.

All Products Prints T-Shirts Mugs Pillows

"Be rational."

from $19.00

A=Pi r 2, 'All this stuff about 'pie are square' makes me HUNGRY!'

A=Pi r 2, 'All this stuff about 'pie are square' makes me HUNGRY!' mockup

A=Pi r 2, 'All this stuff about 'pie are square' makes me HUNGRY!'

from $19.00

"Would anyone care for some Pi"

from $19.00

Lesser Known Digits of Pi

from $19.00

Math Dreams

from $19.00

"If you need us we're available 22/7." mockup

"If you need us we're available 22/7."

from $19.00

"Are we done celebrating Pi Day yet?" "Not until I've completed the 'reading of the digits.'"

"Are we done celebrating Pi Day yet?" "Not until I've completed the 'reading of the digits.'" mockup

"Are we done celebrating Pi Day yet?" "Not until I've completed the 'reading of the digits.'"

from $19.00

"You sure you don't want any Pi?" mockup

"You sure you don't want any Pi?"

from $19.00

The Pi Advantage

from $19.00

'I have to agree -- the value of pie goes on indefinitely.'

'I have to agree -- the value of pie goes on indefinitely.' mockup

'I have to agree -- the value of pie goes on indefinitely.'

from $19.00

Pi fight!

from $19.00

Though he created more than 300 products from peanuts, George Washington Carver was unable to change even one of them back into a peanut.

Though he created more than 300 products from peanuts, George Washington Carver was unable to change even one of them back into a peanut. mockup

Though he created more than 300 products from peanuts, George Washington Carver was unable to change even one of them back into a peanut.

from $19.00

"I keep feeling we should float the company"

"I keep feeling we should float the company" mockup

"I keep feeling we should float the company"

from $19.00

Pi Ala Mode.

from $19.00

"So, Bob... anything you'd like to tell me about your little trip to the hunting store on Boxing Day?"

"So, Bob... anything you'd like to tell me about your little trip to the hunting store on Boxing Day?" mockup

"So, Bob... anything you'd like to tell me about your little trip to the hunting store on Boxing Day?"

from $19.00

Fantasy Business Management

from $19.00

Never write a sonnet on an empty stomach

Never write a sonnet on an empty stomach mockup

Never write a sonnet on an empty stomach

from $19.00

'Professor Higgenbottom will have the number π and I'll have the number √-i.'

'Professor Higgenbottom will have the number π and I'll have the number √-i.' mockup

'Professor Higgenbottom will have the number π and I'll have the number √-i.'

from $19.00

Nethead strip: Personality of a computer nerd #2

Nethead strip: Personality of a computer nerd #2 mockup

Nethead strip: Personality of a computer nerd #2

from $19.00

Woman crushed under satin sheets. mockup

Woman crushed under satin sheets.

from $19.00

Letsby Avenue

from $19.00

It's National Pie Day! Let's celebrate. mockup

It's National Pie Day! Let's celebrate.

from $19.00

Entrance code to MENSA club - 'To enter, simply type in the square root of Pi.'

Entrance code to MENSA club - 'To enter, simply type in the square root of Pi.' mockup

Entrance code to MENSA club - 'To enter, simply type in the square root of Pi.'

from $19.00

Geek in indignation at fellow geek's T-shirt which says: 'I'm with someone who can only recite pi to 100 decimal places.'

Geek in indignation at fellow geek's T-shirt which says: 'I'm with someone who can only recite pi to 100 decimal places.' mockup

Geek in indignation at fellow geek's T-shirt which says: 'I'm with someone who can only recite pi to 100 decimal places.'

from $19.00

Turkey Sandwich anyone?

from $19.00

'You have your Boxing Day dip and I'II have mine...'

'You have your Boxing Day dip and I'II have mine...' mockup

'You have your Boxing Day dip and I'II have mine...'

from $19.00

Boxing Snowmen.

from $19.00

Peacekeeping?

from $19.00

Man checks the gears in his chest. mockup

Man checks the gears in his chest.

from $19.00

"Quick conference...this is rhubarb pie...do we like it or not?"

"Quick conference...this is rhubarb pie...do we like it or not?" mockup

"Quick conference...this is rhubarb pie...do we like it or not?"

from $19.00

"They're gaining on us - start throwing the doughnuts."

"They're gaining on us - start throwing the doughnuts." mockup

"They're gaining on us - start throwing the doughnuts."

from $19.00

War and Peace

from $19.00

'We'd like one pizza cut into eleven pieces.'

'We'd like one pizza cut into eleven pieces.' mockup

'We'd like one pizza cut into eleven pieces.'

from $19.00

"I love Boxing Day"

from $19.00

"Let's save this gift wrap. I'm sure we can use it again. Remind me not forget about using this next year."

"Let's save this gift wrap. I'm sure we can use it again. Remind me not forget about using this next year." mockup

"Let's save this gift wrap. I'm sure we can use it again. Remind me not forget about using this next year."

from $19.00

Pi Day T-Shirts Collection

Pi Day Mugs

Explore our collection of Pi Day mugs filled with witty slogans, math humor, and colorful designs to keep the celebration going with every sip.

Pi Day Pillows

Cuddle up with our Pi-themed pillows—wrapping you in comfort and clever math design, ideal for any Pi Day celebration or math enthusiast’s home.

Pi Day Prints

Bring mathematical beauty into your space with our Pi-themed prints, perfect for decorating classrooms, offices, or living rooms with a bit of geeky charm.