How Can I do Back-of-the-Envelope Sizing for QPS, Bandwidth, Storage, and Peak vs. Average Load?

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How Can I do Back-of-the-Envelope Sizing for QPS, Bandwidth, Storage, and Peak vs. Average Load?

Back-of-the-envelope sizing is a quick, rough calculation method for estimating a system’s capacity needs (like requests per second, bandwidth, and storage) to handle expected workloads, balancing both average demand and peak spikes.

Why Capacity Estimation Matters

When designing or scaling a system, engineers use these ballpark estimates to sanity-check that the architecture can meet demand.

In [system design interviews](https://www.designgurus

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