Methodology
Request volume is multiplied by average token sizes and billing days. Input and output totals are priced separately and summed.
Token and API Costs
AI API Usage Calculator
Project monthly AI API tokens and cost from request volume, average payload size, and model rates.
Interactive Tool
Build a Scenario
ModelSearch by model, developer, or canonical ID.
| Result | Value | How to read it |
|---|---|---|
| Requests / month | 300K | Daily requests multiplied by billing days. |
| Input tokens / month | 360M | Monthly billed input volume. |
| Output tokens / month | 90M | Monthly billed output volume. |
| Estimated monthly spend | $8,100.00 | List-price token estimate for the selected model. |
| Average cost / request | $0.03 | Blended input and output token cost. |
Retries, failed calls, moderation, storage, and non-token units are excluded unless they are included in the request assumptions.
Catalog model: Anthropic Claude Fable 5 →
Inputs
What the Calculation Needs
| Input | How it is used |
|---|---|
| Requests per day | Successful model calls expected each day. |
| Tokens per request | Average billed input and output tokens. |
| Billing days | Active days included in the forecast month. |
| Model | Supplies sourced input and output prices. |
How to Interpret the Result
Run low, base, and high scenarios. Token averages often hide long-tail requests that dominate both spend and rate-limit consumption.
Boundaries
What the Result Does Not Prove
- Failed calls, retries, and moderation calls are excluded unless included in request volume.
- Tiered and negotiated pricing is not modeled.
- Rate limits require the separate peak-capacity calculator.
Catalog values retain their source and freshness on the linked model, provider, benchmark, or comparison page. Editable scenario assumptions are not Model Markets measurements.
Continue the Analysis
Related Tools
| Tool | Next question |
|---|---|
| LLM Cost Calculator | Price one explicit token workload against an exact published provider endpoint. |
| Rate Limit Calculator | Size an AI API quota from peak behavior rather than monthly averages. |
| Monthly AI Spend | Build a bottom-up monthly AI budget from product or team behavior. |
Questions
API Usage Calculator FAQs
What does the AI API Usage Calculator calculate?+
Translate request-level product assumptions into monthly token demand and spend. It returns requests, input tokens, output tokens, and list-price cost per day and month.
Does the AI API Usage Calculator use current model data?+
Where the calculation needs model facts, it uses the current Model Markets catalog snapshot updated 2026-09-02. User-entered assumptions remain clearly editable, and unsupported values stay unknown rather than being inferred.
What should I verify before using the AI API Usage Calculator result?+
Failed calls, retries, and moderation calls are excluded unless included in request volume. Tiered and negotiated pricing is not modeled. Rate limits require the separate peak-capacity calculator. Open the linked canonical records and primary sources before making a production or purchasing decision.