Grokking the System Design Interview, Volume II
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Design Reddit: Capacity Estimation

Step 3: Back-of-the-Envelope Capacity Estimation

To design for scale, let's estimate the expected workload and data volumes:

Summary

  • Scale: 500 million monthly users (MAU), 10 million daily users (DAU) → hundreds of thousands online at once.
  • Read/write ratio: 95% read operations (browsing), 5% write operations (posting, commenting, voting).
  • Posts per day: ~1 million new posts → sustained high write throughput.
  • Comments per day: ~10 million new comments → very high read/write demand

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