Solo estimation
Three questions. No timer. Think it through.
Saved on this deviceFermiggThree questions. Your best guess.
Play Fermigg: estimate a number, discover the answer and get closer to 1×.
TODAY’S SET
Your next good guess
From massive to minute, today’s questions look at scale from every angle.
Q1Question 1A NEW PERSPECTIVE
Q2Question 2A NEW PERSPECTIVE
Q3Question 3A NEW PERSPECTIVE
Friend match
Two players. Same questions. See who gets closer.
Create or join an invite room1
Estimate
Make one guess per question.
2
Reveal
See the answer and reasoning.
3
Compare
Get your 3-round average score.
A good guess is only the beginning.
How to play Fermigg
Break it down.
Each Fermigg question takes one positive number. Use your intuition, scratch notes and the built-in calculator. Check the unit, then lock in your estimate.
Meet the real number.
Fermigg reveals the reference answer, your error multiplier and an example calculation. In a friend match, the reveal waits until both players answer or time runs out.
See how close you got.
Your Fermigg solo score averages all three multipliers. Closer to 1× is better. Review every answer, share your result, or compare guesses with a friend.
How does the Fermigg multiplier work?
1× is a perfect estimate.
Divide the larger number by the smaller. In Fermigg, a guess of 1,000 against an answer of 800 scores 1.25×. A guess of 400 scores 2×. Underestimates and overestimates use the same rule.
In Fermigg friend matches, fewer missed answers wins first. If misses are equal, the lower sum of answered multipliers wins. For a complete match, that also means the lower average wins.
FERMIGG / SCORING LABTRY IT
THE ART OF GETTING CLOSE
1.25×
A pretty good guess.
Your estimate1,000
Reference answer800
2001× IS PERFECT2,000
Example: kernels on an ear of corn. Lower is closer.
A worked Fermigg estimate
Start with something you can picture
Imagine estimating the number of sweets in a jar. This is an illustrative exercise, not an answer from the Fermigg question packs. Instead of inventing a total immediately, picture one layer across the bottom, then estimate how many layers fit inside.
A useful Fermigg starting point is a familiar object or quantity. If a layer holds about 20 sweets and the jar is roughly 15 layers tall, your first estimate is 300 sweets.
Give your assumptions a sensible range
Before submitting a Fermigg answer, ask which assumption could be furthest off. Perhaps the rounded jar holds only 12 full layers, or perhaps each layer fits 25 sweets. Those alternatives suggest a rough range from 240 to 375.
Use the Fermigg calculator to compare the alternatives. Choose one positive number supported by your assumptions; a range helps you reason, but the answer field takes a single estimate. Extra decimal places do not make uncertain assumptions more accurate.
Read the result as a ratio
Suppose your Fermigg guess is 300 and the reference answer is 240. Dividing 300 by 240 gives 1.25×. A guess of 192 also scores 1.25×, because 240 divided by 192 gives the same ratio. Proportional overestimates and underestimates are treated equally.
Across three Fermigg questions, scores of 1×, 1.5× and 2× average to 1.5×. A perfect round cannot cancel a large miss, so check every answer for an accidental extra zero.
Build better Fermigg guesses
Check the unit before the arithmetic
Read the unit beside the Fermigg answer field before calculating. A question about minutes needs a different number from one about hours, even when both describe the same event. Write the conversion down rather than trusting a mental shortcut.
For a Fermigg estimate involving several steps, keep the units attached to your scratch notes. For example, 30 items per minute for two hours means 30 multiplied by 120, not 30 multiplied by two.
Separate the factors you are estimating
Large Fermigg quantities become easier to handle when you split them into a few smaller factors. A daily total might be people multiplied by visits per person. A capacity estimate might be rows multiplied by places per row.
Avoid counting the same factor twice. In Fermigg, multiplying by the number of days after already estimating a yearly total can overwhelm otherwise reasonable reasoning. Before locking in, say what each number represents and check that the final unit matches the question.
Review your Fermigg reasoning
After the reveal, compare your assumptions with the explanation, not just the final number. If your Fermigg result is far from 1×, identify whether the problem came from your starting estimate, a conversion, or arithmetic. Each calls for a different adjustment next time.
Try changing one assumption and recalculating in your notes. This makes the review useful even when you now know the answer. Remembering a reference number is different from learning a method you can apply to an unfamiliar question.
Choose your Fermigg session
Solo practice at your own pace
Choose solo Fermigg when you want time to think through an unfamiliar scale. There is no countdown, so you can outline a calculation, check the units and revise the number before submitting. Once you lock it in, that answer is final.
The Fermigg archive lets you revisit available question sets. On a replay, try a different route to the estimate and compare your assumptions. Your first completed score remains saved; practice does not overwrite it.
A fair Fermigg friend match
Open a Fermigg room and send the invitation link to one friend. Both players receive the same questions. Agree to reason independently without looking up answers, then compare methods after the reveal rather than giving hints while the round is active.
In multiplayer Fermigg, submitting before time runs out matters. The winner is decided by fewer missed answers first, then the summed multipliers for answered questions. When both players answer every question, the lower average also wins.
Keep practice and progress in perspective
Fermigg rotates through four built-in question packs; it is not an unlimited supply of new puzzles. Repeated questions are opportunities to test a different reasoning method. For a less familiar challenge, pick an available set you have not played before.
Completed solo Fermigg scores are stored in the current browser, so another device will not automatically show the same history. Clearing browser storage can remove those records. Friend matches run on cloud servers, so you do not need to host a game server on your computer.
What is Fermigg?
Fermigg is an estimation game built around everyday quantities. Reason from simple assumptions, submit a number, and review the explanation after each answer.
Fermigg is an independent estimation game with four playable question collections, solo practice and live two-player matches. Explore the question library or read the full rules and scoring examples.
Fermigg questions & answers
Does the Fermigg puzzle change every day?
A question set rotates daily on Eastern Time from four built-in packs. Each set contains three questions, ready to play at your own pace.
Can I use a calculator in Fermigg?
Yes. Open the Fermigg calculator during a question to work through arithmetic, parentheses, percentages, or π. There is also space for scratch notes.
Can I play Fermigg on my phone?
Yes. Use a modern browser on your phone, tablet, or computer. No app download is needed; a friend can join from another device using your invitation link.
How do Fermigg multiplayer rounds end?
Answers appear after both players submit or time runs out. Fewer missed answers wins; ties compare total error on answered questions. Rounds run on cloud servers, including when players briefly disconnect.
Where are my Fermigg results saved?
Completed solo results stay in this browser. Friend rooms support refresh and short reconnects and expire after 24 hours without activity.
Can I practice previous Fermigg questions?
Yes. Open the archive to choose any available question set. Replaying lets you try a different approach without overwriting your first completed score.
What is Fermigg?
Fermigg is the name of this independent estimation game at fermigg.com. Play solo, invite a friend, or revisit one of the four available collections.
Are “femi gg” or “fermy gg” different games?
If you were looking for Fermigg, these may be typing or spelling mistakes. Bookmark this page or share a direct invitation link to find the same game again.