Mole day is celebrated every year on October 23 from 6:02 am to 6:02 pm. This holiday honors chemistry’s own measurement unit corresponding to Avogadro’s Number: 6.02 x 1023. You can spend the day learning more about the mole, play a few rounds of “Whack a Mole” or have some guacamole.
Mole Day Puns
What better way to spend Mole Day than sharing a few mole puns with our friend Chemistry Mole.

Celebrate Mole Day With Style
Looking for a fun way to show your chemistry pride? Check out our “What’s a Mole’s Favorite Element? Mole-ybdenum” design, a clever Mole Day pun featuring a cartoon mole holding the molybdenum element tile. Perfect for t-shirts, hats, mugs, stickers, and classroom posters, this design combines humor and science to make your Mole Day celebration unforgettable.
Mole Day Jokes and Riddles
Yes, there is an entire category of chemistry jokes and puns dedicated to moles.
Q: What did one mole say to the other?
A: We have great chemistry together.
Q: What did Avogadro teach his students in math class?
A: Mole-tiplication
Q: What kind of test do chemistry students like best?
A: Mole-tiple choice
Q: Why is it bad to tell mole jokes?
A: It’s mole-itically incorrect.
Q: What did the generous mole say when people crashed his party?
A: The mole the merrier
Q: What are mammoles?
A: Four-legged ani-moles
Q: How would you describe a stinky chemist?
A: Mole-odorous
Q: What kind of fruit did Avogadro eat in the summer?
A: Water-mole-ns
Q: Which tooth did Avogadro have pulled?
A: One of his mole-ars
Q: Why does Avogadro like Cindy Crawford?
A: She’s his favorite super-mole-dle (and she has a mole).
Q: How rich is Avogadro?
A: He’s a multi-mole-ionaire.
Q: Why was there only one Avogadro?
A: When they made him, they broke the moled.
Q: What does Avogadro put in his hot chocolate?
A: Marsh-mole-ows
Q: What illness kept Avogadro in bed for two months?
A: Mole-onucleosis
Q: What do you get when you have a bunch of moles acting like idiots?
A: A bunch of mole-asses
Funny Mole Day Definitions
Chemistry definitions are no joke, but the Mole Day definitions for made-up words and units are amusing.
- Demoleition: Demoleitions it e destruction moles cause in your yard and chemistry homework if you forget Avogadro’s number.
- Dismole: If you feel sad on Mole Day, then you feel dismole.
- Imoleble: Being imoleble means something is completely unrelated to a mole.
- Mol: The symbol for mole is mol (and that’s not made up).
- Mole-mole: A mole double agent is a mole-mole.
- Molearchy: A molearchy is a government controlled by moles.
- Molebile: When you hang a Mole Day decoration from the ceiling, it’s a molebile.
- Molect: You molect a collection of Mole Day T-shirts, games, and other mole stuff.
- Molectomy: Molectomy is the study of mole anatomy.
- Molehill: A mole hill is a small mound of dirt in your backyard made by burrowing moles. In contrast, a molehill is a large mound of chemistry homework on your desk.
- Moleism: Moleism is the reverence given to moles on Mole Day or on any day by a chemist.
- Molelaberate: You work together or moleaborate on a Mole Day project.
- Moleodic: The sound of Mole Day songs is moleodic.
- Molesquito: The molesquito is a tiny, winged, mole-like creature that drinks the blood of a person who forgets the date of Mole Day.
- Remolte control: A remolte control is a device used to watch television shows about chemistry and moles.
- Remoletly: Having to do with mole, but barely.
- Sophomole: A sophomole is anyone in the 10th grade who is taking chemistry.
- Thermole: A thermole is an adjective describing one mole of an explosive.

















