Default assumptions
- Active users1,000
- Requests/user40/month
- Input tokens800/request
- Output tokens500/request
- Retry allowance10%
AI startup calculator
AI API Cost Calculator
Estimate monthly AI API cost from users, requests, input tokens, output tokens, model pricing, retries, and app overhead.
Plain-English API meaning
What does API mean here?
An API is a way for one piece of software to talk to another piece of software. In this calculator, it means the paid connection between your website, app, tool, or automation and an AI model.
Instead of a person opening ChatGPT and typing, your software sends text to an AI provider automatically. The AI model sends an answer back. The provider may charge based on how much text goes in, how much text comes back, how many requests are made, or a mix of those things.
Simple example: a visitor uses your AI business-name generator. Your site sends the request to an AI model, the model sends back name ideas, and that usage creates an API cost. This calculator helps estimate that cost before the little robot vending machine starts eating quarters.
What this AI API cost calculator estimates
This calculator estimates monthly requests, input tokens, output tokens, retry-adjusted token usage, API cost, overhead, total cost, revenue, and gross profit.
How to use the numbers
Use conservative token estimates. A product demo with short prompts can look cheap, then the real app starts storing context, generating long answers, retrying calls, and politely eating the snack cabinet.
Truth-check
Actual costs depend on model prices, prompt size, response length, caching, retries, background tasks, rate limits, user behavior, abuse prevention, and vendor pricing changes.
Pricing note
Use current model pricing from your provider before making financial decisions. This calculator uses editable planning assumptions, not live vendor rates.
FAQ
What does API mean here?
Here, API means the software connection between your app and an AI model. Your app sends a request, the AI model sends a response, and the AI provider charges for the usage.
How are AI API costs calculated?
Most API costs depend on input tokens, output tokens, request volume, and the model price for each type of token.
Should I include failed calls?
Yes. Retries, failed requests, testing, and background jobs can all use tokens.
Can this calculate SaaS margin?
It gives a rough gross profit estimate when you enter revenue per user and monthly overhead.
Related calculators
These calculators are rough planning tools. They are not legal, tax, financial, or licensing advice. API pricing, token usage, vendor terms, taxes, and real-world app costs may vary.