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API Capacity Planning Calculator
Estimate concurrent requests, bandwidth, and rough capacity from requests per second, latency, and payload size.
How to use this tool
- Enter requests per second, average latency, and average payload size.
- Review estimated concurrency, bandwidth, and daily traffic values.
- Optionally set a max concurrent limit to estimate sustainable RPS.
Planning use cases
- Translate traffic forecasts into rough infrastructure load requirements.
- Estimate concurrency pressure on application workers and connection pools.
- Generate a lightweight report for architecture or capacity review threads.
Model assumptions
- Estimates assume relatively steady traffic and average latency behavior.
- Burst traffic, retries, queuing, and high tail latencies are not modeled directly.
- Use as directional planning input, then validate with load tests.
FAQ
- How precise are these numbers?
- They are quick planning estimates. Real systems need overhead margins and empirical testing.
- What payload size should I enter?
- Use average kilobytes per request and include both request and response sizes for a fuller estimate.
- Can this model p95 or p99 latency?
- Not directly. Re-run the estimator with higher latency values to simulate stricter scenarios.
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