estimation-fermi
Fermi Estimation
Table of Contents
Example
Question: How many piano tuners are in Chicago?
Decomposition:
- Chicago ~3M people ÷ 3/household = 1M households
- ~1 in 20 has piano = 50,000 pianos, tuned once/year
- Tuner: 250 days/year × 4 tunings/day = 1,000/year
- 50,000 ÷ 1,000 = ~50 piano tuners (Actual: ~80-100, within order of magnitude)
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