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API Rate Limit Calculator

Convert between RPS, RPM, RPH, RPD.

RPS
1.667
RPM
100.0
RPH
6000
RPD
144,000
Average gap between requests: 600.00 ms
If steady at this rate: 1.67 req/sec

Common API limits (2026 list)

  • Anthropic API tier 1: ~50 RPM
  • OpenAI tier 3: 5,000 RPM
  • Twilio SMS (US): 1 msg/sec/number
  • Stripe API: 100 RPS read, 100 RPS write
  • GitHub REST: 5,000 req/hour authenticated

For burst handling, most APIs use a token-bucket algorithm: you can spike up to a burst limit, then refill at the steady rate. The "average gap" assumes perfectly even spacing. Real traffic is bursty; size your bucket accordingly.

About

Enter requests and a time unit. Get equivalents per second, minute, hour, and day, plus the average gap between requests in milliseconds. Useful for budgeting against API rate limits.

How to use

  1. Enter requests and time period.
  2. Read all conversions.

FAQ

Is the gap between requests fixed?+

Most APIs use a token-bucket: you can burst up to a limit then refill at steady rate. The 'average gap' assumes perfectly even spacing, which real traffic rarely does.