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API & Backend Cost Calculators

Plan and price your backend with confidence. These free tools estimate API costs, convert traffic to requests per second, size your server fleet, and work out bandwidth, hosting, REST and GraphQL spend for 2026.

Cost & pricing

Estimate what your API costs to run and what to charge for it.

API Cost Calculator API Usage Cost Calculator API Pricing Calculator REST API Cost Calculator GraphQL Cost Calculator Webhook Cost Calculator

Traffic & capacity

Convert volume to throughput and size your infrastructure.

API Calls Per Month Calculator API Requests Per Second Calculator API Bandwidth Calculator API Server Capacity Calculator API Hosting Cost Calculator

Frequently asked questions

How do I estimate API costs?

Combine the per request or compute fee with bandwidth for the responses you send. The API cost calculator does both and projects how the bill grows with traffic.

How do I size servers for an API?

Convert monthly traffic to peak requests per second, then multiply by response time to get concurrency, which sets your server count. The RPS and capacity calculators cover both steps.

What usually drives backend costs up?

Compute for handling requests, bandwidth egress for large responses, and chatty designs that force many small calls. The breakdown charts show which applies to you.