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📡 API Latency & Throughput Estimator
Estimate concurrent requests, bandwidth, and rough capacity from requests per second, latency, and payload size.
API Latency & Throughput Estimator
Estimate concurrent requests, bandwidth, and rough capacity from requests per second, latency, and payload size—ideal for quick API capacity planning.
Traffic profile
Requests per second (RPS)
Average latency (ms)
Avg payload (kB per request)Include both request and response sizes for a full picture if needed.
Max concurrent requests (optional)If provided, we'll estimate the maximum sustainable RPS given your latency.
api capacity planning calculatorrequests per second calculator
Throughput & concurrency
Estimated concurrent in-flight requests
20
Bandwidth (approx. Mbit/s)
4.096
Traffic per day (GiB)
41.199
Max RPS from concurrency limit & latency
2,500
How to use this tool
- Enter your expected or measured requests per second, average latency, and payload size.
- Review the estimated concurrent in-flight requests and bandwidth requirements.
- Optionally add a concurrency limit to see how many requests per second your service can sustain.
Requests per second calculator for APIs
- Translate high-level traffic numbers into concrete concurrency and bandwidth.
- Use the outputs to size instances, connection pools, and load balancers.
- Great for quick discussions with SREs, PMs, or stakeholders about expected load.
Assumptions and limitations
- Assumes steady-state traffic with roughly constant RPS and latency.
- Does not account for burstiness, queuing, retries, or tail latency.
- Treat values as ballpark estimates rather than precise capacity guarantees.
FAQ
- How accurate are these calculations?
- They provide back-of-the-envelope estimates. Real-world systems add overhead, variability, and safety margins.
- Should I use bytes or kilobytes for payload?
- Enter kilobytes per request. If you have bytes, divide by 1024 first. Include both request and response sizes for best estimates.
- Can I plan for p95 or p99 latency with this?
- This tool uses a single average latency. For stricter planning, repeat the calculation with higher latency values to see how concurrency changes.
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