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.
- Inside a Modern Workplace
- Inside Something Tiny
- Inside the Juice Aisle
- Keeping a Capital Moving
- Keeping a Country Connected
- Keeping Cars Moving
- Life on Two Wheels
- Mapping a Megacity
- Mapping the Daily Commute
- One Shade on the Road
- One Very Full Stadium
- One Very Full Truck
- One Very Long Walk
- Our Galactic Neighborhood
- Packed for the Move
- Packing the Wide-Body
- Paying for the Fast Lane
- Power Across a Continent
- Retail Trading Friction
- Supplying the Courts
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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.