OpenAI Cost Calculator
Estimate GPT and OpenAI API spend before your AI app usage scales.
Estimate OpenAI API costs for GPT models using input tokens, output tokens, and daily requests. Calculate daily, monthly, and yearly AI spend. Everything runs as a static browser tool with no login, database, or AI API call.
OpenAI planning
Estimate GPT token spend
Model your OpenAI API budget from average prompt size, response length, and daily traffic before your product scales.
Estimated OpenAI spend
GPT-5 Mini
Input $0.25 / 1M tokens · Output $2.00 / 1M tokens
Good default for high-volume SaaS drafts, chat, and routing.
Per day
$3.15
Per month
$94.50
Per year
$1,150
Per 1k requests
$1.575
Compare OpenAI model costs
Based on your token and request assumptions above. Verify current provider pricing before production budgeting.
| Model | Input price | Output price | Monthly estimate |
|---|---|---|---|
| GPT-5 | $1.25 / 1M | $10.00 / 1M | $473 |
| GPT-5.5 | $1.25 / 1M | $10.00 / 1M | $473 |
| GPT-5 Mini | $0.25 / 1M | $2.00 / 1M | $94.50 |
| GPT-4o | $2.50 / 1M | $10.00 / 1M | $585 |
| GPT-4o Mini | $0.15 / 1M | $0.60 / 1M | $35.10 |
Estimate GPT API costs per day, month, and year
Compare OpenAI model costs from local reference prices
Calculate cost per 1,000 requests without sending data to a server
Use cases
Best practices
FAQ
What is an OpenAI cost calculator?
An OpenAI cost calculator estimates API spend from input tokens, output tokens, model prices, and request volume.
How are OpenAI API costs calculated?
OpenAI API cost is estimated by multiplying input tokens by input price and output tokens by output price, then scaling by request volume.
What is the difference between input and output tokens?
Input tokens are the prompt and context you send to the model. Output tokens are the generated response returned by the model.
How do I estimate monthly OpenAI cost?
Estimate average tokens per request, multiply by daily requests, apply model prices, then multiply daily spend by 30 days.
How can I reduce OpenAI API costs?
Reduce prompt length, cap max output tokens, cache repeated answers, route simple tasks to cheaper models, and monitor power users.
Does this tool call the OpenAI API?
No. It is a static browser calculator. It does not call OpenAI, require an API key, or upload your data.