How to Play
01. Make your best guess
No Googling. Just napkin math, gut instinct, and a built-in calculator when you need it.
Q1 / 3 Fermi.gg
How many iPhones have been produced since the launch in 2007?
|your guess iPhones
Lock it in ↵
Q1 / 3 Fermi.gg
You landed
1.45× Too Low
closer than 62% of players
How everyone guessed
180 1.8Kanswer 18K
02. See how close you were
We reveal the answer and score you based on how far off you are (as a multiple of the real answer). We also give you some example math you could've used.
03. Compare with friends
Get your daily score, see how you compared to the rest of Fermi players, and share your result with friends.
Score
1.94×
Top 8%
How everyone did
1× 10× 100× 1,000×
Questions
How many Oreos are eaten in the US each day? < 1.45×
How many paper bus tickets are printed in London each year? > 2.18×
How many steps does a mail carrier walk in a year? < 2.30×
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What is a Fermi question?
Fermi.gg is a daily game based on the famous "Fermi estimation" technique of using quick math and guesses to get close to hard-to-know numbers. The physicist who popularized the concept, Enrico Fermi, famously estimated the strength of an atomic bomb based on how far paper scraps flew from his hand. Every day, you'll get three questions to guess at and see how you compare to everyone else. Good luck!!
Submit your own question
Got an idea? Chalk it up.
What would it cost to fill an Olympic pool with 2% milk? -Jeff How many tennis balls fit in a school bus? -Judy How many pet snakes live in England? -Robby