How does the AI API Cost Calculator work?

Cost = (input tokens ÷ 1000) × input rate + (output tokens ÷ 1000) × output rate Then: Rates are per 1,000 tokens (or per million tokens on newer models) Then: Monthly cost = cost per request × monthly request volume Then: Input tokens are typically cheaper than output tokens.

Can you give an example of how to use the AI API Cost Calculator?

Example: Input GPT-4o: 500 input + 200 output tokens, 1000 req/month gives a result of ~$3.25/month.

Is the AI API Cost Calculator free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the AI API Cost Calculator?

Our AI API Cost Calculator uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

Practic

AI API Cost Calculator

Model

Input Tokens per Request

Output Tokens per Request

Monthly Requests

An AI API cost calculator estimates the cost of using large language model APIs based on token usage. AI APIs charge separately for input (prompt) and output (completion) tokens.

Symbol	Name	Unit	Description
T_in	Input tokens	tokens	Tokens sent to API
T_out	Output tokens	tokens	Tokens generated by API
rate_in	Input rate	$/1M tokens	Price per million input tokens
rate_out	Output rate	$/1M tokens	Price per million output tokens

Model	Input ($/1K)	Output ($/1K)
GPT-4o	$0.0025	$0.010
GPT-4o-mini	$0.00015	$0.0006
Claude Sonnet 4	$0.003	$0.015
Claude Haiku 4	$0.0008	$0.004
Gemini 1.5 Pro	$0.00125	$0.005

References

›OpenAI pricing
›Anthropic pricing

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AI API Cost Calculator

AI API Cost Calculator

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