Orders of Magnitude
Rate itGuess absurd quantities to the nearest power of ten.
on oom.giacomotag.io
Orders of Magnitude asks six questions a day about ridiculous quantities, like the number of windows in Manhattan, and you answer by choosing how many zeros the number has. The right power of ten scores 100 points, and each miss costs points depending on how far off you are.
About Orders of Magnitude
Orders of Magnitude is a daily estimation game about gut feeling, made by Giacomo Tagliabue and running since 22 September 2026. Nobody knows how many windows there are in Manhattan or how much you will pee in a lifetime, so the game does not ask for the exact number: you drag a slider to set the power of ten you think is closest, from ten to the power zero up past ten to the power thirty.
Each day has six questions, the same for everyone, worth up to 600 points. The right power of ten earns 100 points, and you lose points for every zero you are off, though big answers are more forgiving than small ones: one zero out at a hundred costs half the points, while one zero out at ten to the power thirty still earns 91. Miss by too many zeros and the question scores nothing. After each answer the game shows the real figure, how many zeros you were off, and explains where its estimate comes from.
The questions are written by people with help from AI, and every answer is a best estimate. Missed days are in the Past puzzles archive. There are no cookies, no ads and no accounts.
It suits fans of Fermi problems and napkin maths who want a few minutes of reasoning about scale.
How to play Orders of Magnitude
- Open Orders of Magnitude and start today's puzzle.
- Read the question about a huge or tiny quantity.
- Drag the slider, swipe or use the arrow keys to choose the number of zeros.
- Press Submit and read how the real estimate was worked out.
- Answer all six questions for up to 600 points.
Screenshots
Tips
- Break the question into parts you can estimate, then multiply.
- For very large quantities, a guess within one or two zeros still scores well.
- Play the Past puzzles to calibrate your sense of scale.
Questions
Do I have to guess the exact number?
No. You only pick the closest power of ten.
How is it scored?
100 points for the right power of ten, fewer for each zero you are off, with larger answers more forgiving.
Can I play earlier days?
Yes, from Past puzzles.
When does a new puzzle come out?
At midnight in your own time zone, the game shows that date's set of six questions. If the new set has not been published yet, it shows the latest published day instead.
Ratings and reviews
Games like Orders of Magnitude
Fermle
One Fermi question a day where you find the power of ten in five tries, or quote a range in its Advanced mode
Fermi
Three numbered estimation questions a day, one guess each, scored by how many times off you are
Guesscale
Three Fermi questions a day, each scored out of 1,000
Far Out
Three estimation questions a day with statistics on how everyone else scored
Off By
Five real-world numbers to estimate a day, scored out of 500 and shown against the crowd's average guess
Estimania
Five numerical trivia questions a day scored by how close your estimates are
Magnitudle
A one-guess daily question about a hard-to-picture number, plus scale comparisons in Size It Up
HowMany
One numbered how-many question a day with a short hint