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VIIInteractive tool · DT-11

Fermi Trainer

Chain your assumptions → an order-of-magnitude estimate.

From the lessonDT-11 · Fermi Estimation: Producing a Number When You Have No Data Client-side · nothing sent

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Fermi Trainer

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Break it into factors you can guess. Multiply, don't agonise — the goal is the right order of magnitude, not the right number.

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Estimate
40,000

Order of magnitude ≈ 10^4. If the true answer is within a factor of ten of this, your estimate did its job.