AI Token Cost Calculator

Free AI token cost calculator. Estimate monthly API costs for OpenAI GPT, Anthropic Claude, Google Gemini and other LLM providers.

✓ Free to use ✓ Instant results ✓ Mobile friendly ✓ No sign-up needed

AI Model

Input Tokens per Request

Output Tokens per Request

Requests per Month

Monthly Cost

Annual Cost

Cost Per Request

Monthly Tokens

✨ More tech tools

🤖 Level up your AI skills

Learn prompt engineering, AI development, and machine learning with bestselling tech books.

Shop AI Books on Amazon →

Understanding LLM API Pricing

Large Language Model APIs are priced per token — roughly 4 characters or 0.75 words. Pricing is split between input tokens (your prompt) and output tokens (the model's response). Output tokens are typically 3–5× more expensive.

Estimating Token Usage

Short prompt + short response: ~300 input / 200 output tokens
Standard chat message: ~500 input / 800 output tokens
Document analysis: ~2,000 input / 500 output tokens
Rule of thumb: 1,000 tokens ≈ 750 words

Frequently Asked Questions

What is a token?+

A token is roughly 4 characters of text, or about 0.75 words. The sentence "Hello, how are you?" is about 5 tokens. Models process text in tokens, and you are billed per token.

Which model is cheapest for production?+

GPT-4o Mini and Gemini Flash are the cheapest options for high-volume applications. For quality at reasonable cost, Claude Sonnet 4 and GPT-4o offer the best balance.

Do prices include VAT?+

API prices listed are typically exclusive of VAT. UK businesses will have VAT added at 20%. Check your provider's billing page for full pricing details.

AI Token Cost Calculator

✨ More tech tools

Understanding LLM API Pricing

Estimating Token Usage

Frequently Asked Questions

Save Your Result