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API Rate Limit Calculator

Calculate rate limits, burst capacity, and throttling for APIs.

Rate Limit Analysis
Max requests per window600
Effective burst capacity20
Sustained throughput10 req/s
Backoff after burst2.0s
Time to full refill2.0s
Max concurrent requests200

Rate limit threshold before 429 errors: ~12 req/s

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Rate Limiting Fundamentals(5min)

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Calculate and visualize API rate limits, backoff strategies, and retry timing. Plan your API request schedule with token bucket algorithms, sliding windows, and exponential backoff calculations.

>[x]Features
  • -Token bucket and sliding window algorithm calculators
  • -Exponential backoff with jitter visualization
  • -Rate limit header parser for common API formats
  • -Visual timeline showing request availability
  • -Configurable burst, refill rate, and window size
  • -Export rate limit configuration as code snippet
>>Use Cases
  • >Planning API integration architecture with rate limit compliance
  • >Debugging 429 rate limit errors and optimizing request patterns
  • >Configuring retry logic with proper backoff timing
  • >Estimating how long batch operations will take under rate limits

Frequently Asked Questions

>What does the calculator estimate??
Given your requests-per-second rate, burst size, window, and refill rate, it computes max requests per window, effective burst capacity, sustained throughput, backoff time, and refill time.
>How do I use it with a real API??
Plug in the rate limit numbers from your provider's documentation (e.g. "100 req/min" becomes 100 window / 60 s) to see safe burst and sustained values before you hit a 429.