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AI API Cost Calculator
Calculate AI API costs for OpenAI GPT-4o, Claude, Gemini, and Llama. Estimate monthly token usage and API spending for your application.
Monthly Cost
$127.5
Per Request
$0.00425
Daily
$4.25
Monthly
$127.5
Annual
$1,551
Context window: 128,000 tokens | Input: $2.5/1M | Output: $10/1M
How to Use the AI API Cost Calculator
Enter your values above for an instant result. This tool uses verified formulas and is optimised for users in USA, Canada, UK, Australia, Europe. All calculations happen in your browser — your data is never sent to our servers.
Frequently Asked Questions
How much does GPT-4o API cost?
GPT-4o costs $2.50 per 1M input tokens and $10.00 per 1M output tokens (as of 2025). A typical chatbot message costs $0.001–0.01.
How do I estimate my monthly AI API costs?
Multiply average tokens per request × requests per month × token price. 1,000 users sending 10 messages/day at 500 tokens each = 5M tokens/day.