Groaners and gigglers

Pi Jokes

The best π jokes, dad-grade puns and math-class groaners we know — sorted into categories so you can find the right one for the moment, whether that's a classroom warm-up or a Pi Day icebreaker.

One-liners

π is unreasonable. It refuses to be rational.
Never argue with π — it goes on forever.
π is the only constant in my life.
I had a fight with a 90° angle. Turns out it was right.
I tried to memorize all the digits of pi. It went on a bit.
Cooking with π is easy. You just go round and round until the timer rings.
Mathematicians don't believe in luck. They believe in pi-ority.
π walked into a bar. The bartender said, "We don't serve transcendentals here." π replied, "That's irrational."
The roundest knight at King Arthur's table was Sir Cumference. He acquired his size from too much π.

Q & A jokes

Q: What do you get when you divide a jack-o'-lantern's circumference by its diameter?
A: Pumpkin π.
Q: Why should you never start a conversation with π?
A: It just goes on, and on, and on…
Q: What do you call a snake that's exactly 3.14 metres long?
A: A π-thon.
Q: What's a math teacher's favourite dessert?
A: π à la mode.
Q: How many pastry chefs does it take to make a pi?
A: 3.14.
Q: What did π say to its therapist?
A: "I just feel so… irrational."
Q: Why did π fail his driving test?
A: He couldn't stop going round in circles.
Q: Why was the equal sign so humble?
A: Because it knew it wasn't less than or greater than anyone else.
Q: What's the official animal of Pi Day?
A: The math-lete.
Q: What did the calculator say to π?
A: "You can count on me."
Q: What's a mathematician's favourite kind of dance?
A: Square dancing — but only after a slice of π.
Q: Why don't mathematicians ever throw out old pi?
A: It never goes off — it just goes on.

Pi puns

Drop these into greeting cards, classroom posters, T-shirt slogans, or any conversation that's drifting towards the equator:

Cutie π
Sweetie π
Easy as π
Magni-π-cent
π-rate (especially when memorizing digits at sea)
Occu-π-ed
Stu-π-d (use sparingly)
Hap-π birthday
Sim-π-ly the best
Pump-π-n spice

The classic walk-into-a-bar

A mathematician, a physicist and an engineer are each asked, "What is π?"
The mathematician answers: "π is the ratio of a circle's circumference to its diameter — irrational and transcendental."
The physicist says: "π is approximately 3.14159, plus corrections of order 10⁻⁶ at standard temperature."
The engineer thinks for a moment, then says: "π? About 3. Call it 4 to be safe."

For the kids

Why did 7 eat 9? Because you're supposed to eat three squared meals a day.
How does π say goodbye? "See you around!"
What's round, sweet, and never ends? A pizza you got with friends. (Also π.)
What did the zero say to the eight? "Nice belt!" And what did π say? "Show-offs."
Why did the math book look sad? Because it had too many problems — and not enough π.

Tell us yours

Got a better one? Tell it on Pi Day, March 14, when the audience is most receptive. If it lands, write it down. If it doesn't, blame the engineer.