API Rate Limit Calculator
Convert API limits into per-second and per-user numbers.
Keep or share the finished result
Copy or share after running the tool. Saved tools and settings stay in this browser.
What would you like to do next?
Calculate API rate limits
API rate limits are often described as requests per window, but engineering plans usually need per-second and per-user numbers. Enter allowed requests, window seconds and active users to calculate RPS, requests per user per window and RPS per user. It is useful for API clients, integration planning, queue design and throttling notes.
Rate limit planning
Use the result to decide whether requests need batching, caching, backoff or queueing.
Frequently asked questions
What is a rate limit window?
It is the time period over which the request allowance is measured.
Does this handle burst limits?
No. It calculates average rates from the values entered.
Can I use it for multiple users?
Yes. Enter active users to estimate per-user allowance.