API Rate Limit Calculator

Translate an API rate limit into requests per second, planned runtime and safe pacing delay.

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Requests/sec -
Delay/request -
Minimum runtime -
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Enter the example value or paste your own input, choose the mode when one is available, and read the first result card for the direct answer. The output area gives a copyable block for code reviews, documentation, API tests, classwork or troubleshooting notes.

What the result means

The calculator divides the allowed calls across the window and estimates how long a planned batch must run without exceeding the limit.

What is not included

It assumes a simple fixed-window limit. Token buckets, burst allowances and per-endpoint limits need their own rules.

Privacy note

The calculation runs in your browser. Avoid pasting production secrets, credentials, private keys, customer data or regulated personal data unless your own policy allows browser-based tools.