Web Tools

Rate Limiter Calculator

Calculate rate limiting parameters for token bucket, fixed window, and sliding window algorithms. View requests per second/minute/hour/day, burst capacity, refill rate, and generate Nginx, Express, and Redis config snippets. Runs entirely in your browser — your data never leaves your machine.

rate-limit api token-bucket nginx security performance

Published May 30, 2026

All interactive tools run entirely in your browser. Your data never leaves your device.

How It Works

Choose a rate limiting algorithm, set your desired requests per window and burst size, and the tool calculates effective rates at different time scales plus generates ready-to-use configuration snippets.

Features

3 algorithms: Token Bucket, Fixed Window, Sliding Window with explanations
Rate calculations: req/s, req/min, req/hr, req/day from your parameters
Burst analysis: bucket capacity, refill rate, average latency budget
Config snippets: Nginx limit_req, Express rateLimit(), Redis key config
Algorithm descriptions: explains behavior including edge cases (boundary overlap for fixed window)
5 examples: API free tier, login endpoint, public API, webhook delivery, high-throughput
Private: runs entirely in the browser — no data transmitted

Use Cases

Planning API rate limits for different tiers
Configuring Nginx rate limiting directives
Understanding token bucket vs sliding window trade-offs
Calculating burst capacity for webhook delivery