Fermi question · Technology
About how many numeric digits can the largest standard QR Code Model 2 hold?
Make a fast, defensible estimate before you reveal the reference answer. Think in factors, not exact recall.
What is your estimate?
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Reference answer
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≈ 7.1 thousand numeric digits
Fermi estimates are judged by scale, so a reasonable approximation can still earn a strong score.
One way to estimate it
Estimate from the largest QR grid and allow for structure, error correction, and encoding overhead.
- Largest grid177 × 177 ≈ 31,000 modules
- Usable data sharewell below the full module count after overhead
- Estimateorder of 10⁴ numeric digits
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