Fermi Questions
Order-of-magnitude estimation questions used in quant and trading interviews, break the unknown into parts, reason to a defensible answer, and track your progress as you solve.
- Building an Ancient Wonder
- Building Material at Scale
- Cables Beneath the Waves
- Charging the Road Ahead
- City After Dark
- Compute in a Blink
- Counting the Blue Planet
- Counting What Grows
- Covering a State
- Covering an Island
- Crossing a Continent on Foot
- Emergency Coverage
- Every Inch of Cargo
- Feeding the World
- Filling the Big House
- Filling the Freight Box
- Filling the Meeting Room
- Fueling the Workday
- Harvesting Sunlight
- Higher Education at Scale
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What are Fermi questions?
Fermi questions ask you to estimate a quantity you can’t look up, like “how many piano tuners are there in Chicago?”, by breaking it into parts you can reason about and combining sensible assumptions. Trading and quant interviewers love them because they reveal how you decompose a problem, handle uncertainty, and sanity-check a number under pressure.
On Tradermath, each question is graded by order of magnitude: get within a factor of ten and you’re on track. Work through the curated set, reveal hints when you’re stuck, and compare your estimate against a full worked solution to build the instinct that matters most in interviews.