39 Hilarious Pi Day Jokes To Spark Infinite Laughter

Why should you never talk to Pi?

Pi Day jokes for kids.

As a refresher: Pi is the ratio of a circle’s circumference to its diameter and it’s always 3.14. Since Pi is constant and never-ending (it’s been calculated to 50 trillion digits beyond the decimal point), it’s great for math jokes. On March 14 (Pi Day—get it, 3.14?), celebrate math, geometry, and any kind of pie you can think of (apple, peach, pumpkin, pizza) with these Pi Day jokes.

1. What do you get when you divide the circumference of a jack-o’-lantern by its diameter?

What do you get when you divide the circumference of a jack-o’-lantern by its diameter?

Pumpkin pi!

2. What’s the best way to serve pi?

What’s the best way to serve pi?

A la mode. Anything else is mean.

A la mode. Anything else is mean.

3. Why should you never talk to Pi?

Why should you never talk to Pi? Because they will go on and on and on forever.

Because they will go on and on and on forever.

4. What do you get when you divide the circumference of the sun by its diameter?

What do you get when you divide the circumference of the sun by its diameter?

Pi in the sky.

Pi in the sky.

5. Why shouldn’t you let advanced math intimidate you?

Why shouldn’t you let advanced math intimidate you?

It’s really as easy as pi!
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It’s really as easy as pi!

6. A statistics professor and a math professor worked together on a cookbook.

A statistics professor and a math professor worked together on a cookbook.

They called it “Pi a la Mode.”***

They called it “Pi a la Mode.”

7. Why did Pi fail their driver’s test?

Why did Pi fail their driver's test?

Because they didn’t know when to stop.

Because they didn’t know when to stop.

8. What do you get when you divide the circumference of green cheese by its diameter?

What do you get when you divide the circumference of green cheese by its diameter?

Moon pi.

Moon pi.

9. What are 3.14% of sailors?

What are 3.14% of sailors?

Pi-rates.

Pi-rates.

10. What’s wrong with the equation “pi r squared”?

What’s wrong with the equation "pi r squared"?

Pi are round.

Pi are round.

11. What did Pi say when asked to explain what Pi Day is again?

What did Pi say when asked to explain what Pi Day is again? 

"I don't want to repeat myself."

“I don’t want to repeat myself.”

12. Why should you never argue with Pi?

Why should you never argue with Pi?

They are completely irrational.

They are completely irrational.

13. What is a math teacher’s favorite snake?

What is a math teacher’s favorite snake?

A pi-thon.

A pi-thon.

14. What did the triangle say to the circle?

What did the triangle say to the circle?

You're pointless.

You’re pointless.

15. What’s the official animal of Pi Day?

What’s the official animal of Pi Day?

The pi-thon!

The pi-thon!

16. What happens when you eat too much pi?

What happens when you eat too much pi?

You get a bigger circumference.

You get a bigger circumference.

17. What do you get when a bunch of sheep stand in a circle?

What do you get when a bunch of sheep stand in a circle?

Shepherd's pi.

Shepherd’s pi.

18. Who was the roundest knight at King Arthur’s table? 

Who was the roundest knight at King Arthur's table? 

Sir Cumference because he ate too much pi.

Sir Cumference because he ate too much pi.

19. What did the math teacher have for dessert?

What did the math teacher have for dessert?

Chocolate pi.

Chocolate pi.

20. What do you call a mathematician who becomes a secret agent?

What do you call a mathematician who becomes a secret agent?

A s-pi.

A s-pi.

21. What was Sir Isaac Newton’s favorite dessert?

What was Sir Isaac Newton’s favorite dessert?

Apple pi.

Apple pi.

22. How did movie critics rate Life of Pi?

How did movie critics rate Life of Pi? 

3.14 stars.

3.14 stars.

23. How are mathematicians like the air force?

How are mathematicians like the air force?

They both use pi-lots.

They both use pi-lots.

24. Why don’t the other numbers take Pi to the party?

Why don’t the other numbers take Pi to the party?

He goes on forever and ever.

He goes on forever and ever.

25. What were the first mathematicians on the Oregon Trail called?

What were the first mathematicians on the Oregon Trail called?

Pi-oneers.

Pi-oneers.

26. Who do kids follow on March 14?

Who do kids follow on March 14?

The Pi-ed Piper.

The Pi-ed Piper.

27. Why don’t you want to get hit in the face with pi?

Why don’t you want to get hit in the face with pi?

It never ends.

It never ends.

28. How many bakers does it take to bake a pi?

How many bakers does it take to bake a pi?

3.14.

3.14.

29. What do you get when you take a bovine and divide its circumference by its diameter?

What do you get when you take a bovine and divide its circumference by its diameter?

A cow pi.

A cow pi.

30. What do you call a mathematician who becomes a private investigator?

What do you call a mathematician who becomes a private investigator?

Magnum Pi.

Magnum Pi.

31. What do mathematicians eat for dinner on March 14?

What do mathematicians eat for dinner on March 14?

Chicken pot pi.

Chicken pot pi.

32. What is 1.57?

What is 1.57?

Half a pi.

Half a pi.

33. Why don’t you get into an argument with pi?

Why don’t you get into an argument with pi?

It goes around in circles.

It goes around in circles.

34. What do you call a young student who loves math and wants to know more about pi?

What do you call a young student who loves math and wants to know more about pi?

An as-pi-ring mathematician.

An as-pi-ring mathematician.

35. What did Pi say to their partner?

What did Pi say to their partner? 

Stop being so irrational.

Stop being so irrational.

36. Why was the math book sad on Pi Day?

Why was the math book sad on Pi Day?

It had too many problems.

It had too many problems.

37. What did the mathematician call his girlfriend on March 14?

What did the mathematician call his girlfriend on March 14?

Sweetie pi.

Sweetie pi.

38. What language should you use on Pi Day?

What language should you use on Pi Day?

Sine language.

Sine language.

39. Why do people need to stop with the pi jokes?

Why do people need to stop with the pi jokes?

We've heard them 3.14 million times already!

We’ve heard them 3.14 million times already!

Share your favorite pi jokes in our We Are Teachers HELPLINE group on Facebook!

And for more laughs, check out our favorite math jokes, grammar jokes, and science jokes.

Looking for some laughs on Pi Day? We gathered 39 of the best Pi Day jokes in what feels like a never-ending list!