>[!abstract] >A Fermi problem is an estimation problem in physics or engineering education, designed to teach dimensional analysis or approximation of extreme scientific calculations. Fermi problems are usually back-of-the-envelope calculations. Fermi problems typically involve making justified guesses about quantities and their variance or lower and upper bounds. In some cases, order-of-magnitude estimates can also be derived using dimensional analysis. A Fermi estimate (or order-of-magnitude estimate, order estimation) is an estimate of an extreme scientific calculation (Wikipedia, 2025). >[!quote] >![[Nabeel Qureshi — Advice That Actually Worked For Me#5. Get in the habit of Fermi estimation, looking up key quantities, and using upper and lower bounds.|clean]] >[!references] >- Fermi Estimates >[!related] >- **North** (upstream): — >- **West** (similar): — >- **East** (different): — >- **South** (downstream): —