API Rate Limit & Throughput Calculator — RPS, Bandwidth & Burst Capacity
Calculate API throughput including requests per second, bandwidth requirements, daily capacity, and burst limits. Supports AWS API Gateway, Cloudflare, Nginx, and custom server configurations with a traffic flow visualization.
Rate Limit Calculator
Results update instantly as you type
Enter Values
Max Recommended Concurrent Users
5,000 users
Server Type
AWS API Gateway
Requests Per Minute
60,000 RPM
RPM Per User
60.00 RPM/user
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Throughput
Traffic Flow
Burst vs. Sustained Capacity
The Formula
Rate limiting controls how many requests a client can make to an API within a given time window. Understanding your throughput helps you plan capacity and avoid 429 (Too Many Requests) errors.
Variable Definitions
Requests Per Minute
The maximum number of API requests allowed per minute.
Requests Per Second
Throughput in requests per second — the steady-state rate your API serves.
Burst Capacity
The maximum short-term throughput your API can handle before rate limiting kicks in.
HTTP 429 Too Many Requests
The HTTP status code returned when a client exceeds the rate limit.
How to Use This Calculator
- 1
Enter your API's maximum requests per minute (RPM).
- 2
Enter the average payload size in KB to calculate bandwidth requirements.
- 3
Optionally enter peak concurrent users to see per-user allocation.
- 4
Select your server type to see burst capacity defaults.
- 5
Use the results to plan infrastructure scaling and set appropriate rate limits.
Common Applications
- Planning API infrastructure capacity by calculating requests per second, bandwidth requirements, and daily throughput
- Setting appropriate rate limits for public APIs to protect backend services from abuse and unexpected traffic spikes
- Determining burst capacity and per-user rate limits when designing API pricing tiers or usage plans
- Estimating bandwidth costs and infrastructure needs for high-traffic web applications and microservices deployments
Rate limiting — requests per time window with a maximum limit threshold
Understanding the Concept
Rate limiting is a critical API management strategy that protects your backend from being overwhelmed by too many requests. When a client exceeds the allowed rate, the server returns HTTP 429 (Too Many Requests). The difference between burst and steady-state capacity is key: burst allows short spikes above the sustained limit, while the sustained rate is what your infrastructure can handle long-term. AWS API Gateway has a default burst limit of 10,000 RPM. Cloudflare offers effectively unlimited burst. Nginx burst depends on worker configurations. For production APIs, set rate limits at 2-3x your expected peak traffic to handle spikes while protecting your backend.
Frequently Asked Questions
Sources & References
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