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API Rate Limit Interval Calculator

Compute safe request rates from quota limits and time windows. Add safety margins to estimate per-request delay and total batch duration without hitting 429 responses.

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Use cases

  • Pick delay intervals before writing bulk API scripts
  • Estimate total runtime under quota caps
  • Set conservative concurrency for third-party APIs

How to use

  1. Enter quota and time window (e.g. 100 calls / 60 seconds)
  2. Set safety margin and batch size if needed
  3. Read safe RPS, interval, and estimated duration

Example input and output

Quota

100 calls / 60 seconds

Safe rate

~1.5 RPS, 667 ms interval

FAQ

Will this guarantee no 429 errors?

It is a steady-rate estimate; some APIs use burst windows—keep a safety margin.

How much safety margin should I use?

10–20% is common to cover retries, other clients, and counting drift.

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