Skip to content

Rate Limit Calculator

Convert an API rate limit and window into requests per second, and check expected traffic for utilization, headroom and an over-limit warning.

Rate Limit Calculator

Output

Working…

Updated . Provided as is. Check the output before you rely on it in production.

How to use Rate Limit Calculator

  1. 1

    Enter the limit

    Enter the number of requests allowed per window.

  2. 2

    Enter the window

    Enter the window length in seconds.

  3. 3

    Enter expected traffic

    Enter how many requests you expect to send per window.

  4. 4

    Read the result

    See the allowed requests per second, your utilization and remaining headroom, so you can set client-side throttling below the limit.

Questions and answers

Why leave headroom?
Retries, clock skew between client and server, and bursts push real traffic above the average. Aiming for 70 to 80% utilization avoids 429 errors.
How do I convert a per-minute limit?
Enter 60 as the window. A 100 per minute limit allows about 1.67 requests per second.

Use it as an API

Rate Limit Calculator is also callable as a free HTTP JSON API at https://aidevhub.io/api/rate-limit-calculator/ — GET with query parameters or POST with a JSON body, no authentication, CORS enabled, fair use (abusive traffic is throttled at the edge; there is no per-request quota header). Responses return { ok, tool, result, meta }. 

curl -s "https://aidevhub.io/api/rate-limit-calculator/?limit=100&window=60&expected=140"

Machine-readable contract: /api/tool/rate-limit-calculator.json All API endpoints: /agents/ LLM site index: /llms.txt

For AI agents: how to call this tool

Machine-readable contract, endpoints and examples. Humans can ignore this section.

Best Path For Builders

Dedicated API endpoint

Deterministic outputs, machine-safe contracts, and production-ready examples.

Dedicated API

https://aidevhub.io/api/rate-limit-calculator/

OpenAPI: https://aidevhub.io/api/openapi.yaml

GET /api/rate-limit-calculator/ GET rate-limit-calculator
POST /api/rate-limit-calculator/ POST rate-limit-calculator

Unified Runtime API

https://aidevhub.io/api/tools/run/?toolId=rate-limit-calculator&a=100

GET and POST are supported at /api/tools/run/ with identical validation and limits.

Limit: 30 req / 60s, input max 256 KB.