API Rate Limit Calculator
Check whether your expected traffic fits inside a provider's rate limit, see how many users you can support, and generate exponential-backoff retry code. Everything runs in your browser — nothing is uploaded.
About this tool
This calculator normalizes a provider's rate limit and your expected traffic to requests per second so they can be compared directly. Average load assumes calls are spread evenly across the day, which real traffic never is — that's what the burst factor is for: peak load is average × burst, and if the peak exceeds the limit you should expect HTTP 429 responses during busy periods even when the daily total fits. Max supported users is the provider's daily capacity divided by one user's daily calls.
The retry snippets implement standard exponential backoff with optional full jitter (a random delay between 0 and the computed backoff, which spreads out retry storms) and honor a Retry-After header when the server sends one. They're a solid starting point, not a full client — everything on this page runs locally in your browser and nothing is uploaded.