Rate Limit Calculator

Calculate token bucket parameters for API rate limiting. This tool runs entirely offline in your browser - no data is sent to servers.

Requests per Second

Maximum allowed requests per second

Burst Factor

How many requests can burst above the rate limit

Time Window (seconds)

Time period for rate limiting calculations

Token Bucket Parameters

Token Rate: 10 tokens/sec

Bucket Capacity: 50 tokens

Max Burst: 5 requests

Refill Time: 0.1 seconds/token

Implementation Notes

Set token rate to 10 tokens/sec and bucket capacity to 50 tokens. Each request consumes 1 token.

Understanding Rate Limiting with Token Buckets

Rate limiting protects APIs and services from abuse by controlling how many requests a client can make in a given time period. The token bucket algorithm is one of the most popular approaches.

How Token Buckets Work

Tokens are added to the bucket at a fixed rate (token rate)
Bucket capacity limits how many tokens can accumulate
Each request consumes one token
If the bucket is empty, requests are rejected until tokens refill

Common Use Cases

API Rate Limiting

Protect backend services from excessive traffic and ensure fair usage

Network Traffic Shaping

Control bandwidth usage and prevent network congestion

Example Scenarios

Standard API (10 req/sec, burst 5x)

10 requests per second with 50 request burst capacity. Suitable for most public APIs.

High Traffic Service (100 req/sec, burst 2x)

100 requests per second with 200 request burst capacity. For high-throughput internal services.

Rate Limit Simulator

Simulated Requests

Duration (seconds)

Allowed Requests: 60

Rejected Requests: 15

Success Rate: 80%

Frequently Asked Questions

How accurate are these calculations?

The calculations follow standard token bucket algorithm principles. Real-world implementations may vary based on specific library or platform choices.

Can I use this for production systems?

This tool provides guidance for initial configuration. Always test rate limits thoroughly in staging environments before production deployment.

What about distributed rate limiting?

This calculator assumes a single instance. Distributed systems require additional considerations like shared state and synchronization.

How This Calculator Works

Token Rate = Requests per Second (direct mapping)
Bucket Capacity = Requests per Second × Burst Factor × Time Window
Max Burst = Burst Factor (from input)
Refill Time = 1 ÷ Token Rate (seconds per token)
Simulation assumes uniform request distribution over time

Disclaimer: For informational and educational purposes only. All processing runs locally in your browser. Rate limiting implementations may vary across platforms and libraries. For production use, verify results with official documentation and testing.

References

Token Bucket Algorithm • Rate Limiting Patterns • Web API Design Best Practices

Menu

Rate Limit Calculator Tokens and Bursts

AI Assistant

Was this tool helpful?