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API Rate Limiter Calculator

Calculate rate limit windows, burst allowances, and retry intervals. Design effective rate limiting for your API endpoints. Code never leaves your device — formatting and validation run locally in your browser.

100% Local Browser Native

How to Use the API Rate Limiter Calculator

1. Fill the inputs

Enter requests with time window.

2. Read the verdict

Check the verdict with limit math.

3. Compare scenarios

Nudge each input up and down in turn — the most sensitive one deserves your attention.

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Frequently Asked Questions

Token bucket or fixed window?

Bucket allows bursts; fixed window is simpler but edges spike at boundaries.

How is burst math done?

Capacity plus refill rate determine sustainable vs peak throughput.

What do 429s carry?

Retry-After headers telling clients exactly how long to wait.

Are my settings uploaded anywhere?

No — calculation runs locally in your browser, free with no signup.

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Calculate rate limits, burst capacities, and throttling thresholds for API gateway configurations. Plan your traffic management strategy.

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Last updated October 2026