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AI API Cost Calculator (LLM Tokens)
Estimate monthly OpenAI, Anthropic, Google Gemini, and Llama API spend from prompt tokens, completion tokens, requests per day, and model selection.
MATHEstimate monthly OpenAI, Anthropic, Google Gemini, and Llama API spend from prompt tokens, completion tokens, requests per day, and model selection.
Detailed instructions, formula notes, and US-context guidance shown in the calculator above.
Disclaimer: Estimate only. Consult a qualified professional for decisions with major financial, legal, or health consequences.
AI API Cost Calculator (LLM Tokens)
Estimate monthly LLM API spend. Token prices fell 280× from 2022-2024, but agentic workflows multiply call volume 10-20× per user task — total spend keeps rising.
Claude Sonnet 4.6 — Monthly Spend
$540.00
Per request$0.01800
Per day$18.00
Input tokens cost$6.00/day
Output tokens cost$12.00/day
Excludes RAG retrieval cost, fine-tuning, batch API discounts (~50%), or volume tier discounts. Prompt caching can cut input cost 75-90% for repeated context.
Frequently Asked Questions
What is the AI API Cost Calculator (LLM Tokens) for?
Estimate monthly OpenAI, Anthropic, Google Gemini, and Llama API spend from prompt tokens, completion tokens, requests per day, and model selection.
How do I use the AI API Cost Calculator (LLM Tokens)?
Detailed instructions, formula notes, and US-context guidance shown in the calculator above.
How accurate are my ai api cost (llm tokens) results?
Estimate only. Consult a qualified professional for decisions with major financial, legal, or health consequences.
Is the AI API Cost Calculator (LLM Tokens) free to use?
Yes - every calculator on WhichCalc is completely free with no signup, no usage limits, and no tracking on the calculation itself. Results display instantly in your browser and your inputs are never sent to a server. Bookmark the page if you use this calculator regularly.