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Life & fun · August 2, 2025

WS

Wordle-style game for Fermi questions

Some months ago @andrewrn tried to create a Wordle-style site for order-of-magnitude thinking. This was a wonderful idea, but the actual site was somewhat over-engineered and confusing. (https://news.ycombinator.com/item?id=43632278) In the past week, I looked at this idea again and built a very simple site which gives you a new Fermi estimation question every day: How many new cars were sold in the US in 2024?; How many humans have ever lived (including those currently alive)?; How many chickens are slaughtered for meat every year? To win, you need a guess within ±20% of the…

Wordle-style game for Fermi questions launched on August 2, 2025 with 35 votes, #523 of 8,530 launches that month and more than 90% of that year's launches. The site was still online in September 2026, 1 year on.

Visit fermiquestions.org ↗Alternativestop 6% of August 2025

In plain words

This daily game presents Fermi estimation challenges where players guess order-of-magnitude answers to questions like "How many chickens are slaughtered annually?" Players have six attempts to get within ±20% of the correct answer, receiving feedback on whether each guess is too high or low. Designed for anyone wanting to develop numerical intuition and estimation skills, it strips away complexity in favor of a straightforward Wordle-like experience focused on quantitative reasoning.

written from the facts on this page · September 2026

From the sources

A Wordle-style game for Fermi questions. Guess the answer to estimation questions in 6 or less tries.

A new game, Fermi Poker, is now available that combines Fermi estimation with poker mechanics — with integrated video chat! When the probability calibration mode is enabled, you are able to log your confidence with each guess and track how well your probabilities match reality. A calibration chart showing whether you're over- or underconfident is available on the stats page. Make a Fermi estimate: break the problem into simple factors, choose round numbers, then multiply. Population a little over 100M -> about 50M households -> roughly 80% own a car -> 40M cars. If cars are replaced about every 10 years, that means roughly 4M new cars sold per year. Guess the answer to estimation questions…from fermiquestions.org

In the maker’s words, at launch

Some months ago @andrewrn tried to create a Wordle-style site for order-of-magnitude thinking. This was a wonderful idea, but the actual site was somewhat over-engineered and confusing. (https://news.ycombinator.com/item?id=43632278) In the past week, I looked at this idea again and built a very simple…

Does a similar job

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