GPT Token Calculator

Estimate API token consumption and calculate costs across major AI models.

Features

• Instant Estimation: Paste massive documents to see the approximate token count instantly.
• Multi-Model Cost Comparison: Compare exact API costs across OpenAI, Anthropic, and Groq.
• BPE Approximation Algorithm: Runs entirely locally without downloading massive dictionary files.
• Privacy First: Your confidential documents are never uploaded to a server.
• Supports Input (Prompt) and Output (Completion) cost estimates.

How to Use

1. Copy your system prompt, user prompt, or context document.
2. Paste the text into the large input area.
3. The Estimated Tokens and Word Count metrics will update instantly.
4. Scroll down to the Cost Estimation Table to see exactly how much it will cost to send via API.

Frequently Asked Questions

What exactly is a Token?

A token is a piece of a word. A helpful rule of thumb is that 1 token is approximately 4 characters of English text.

Is this calculation 100% exact to OpenAI's billing?

No. Our tool uses a highly accurate mathematical approximation to ensure it runs instantly in your browser without massive dictionary files. Your actual billed tokens will be extremely close.

Why are Output costs higher than Input costs?

AI providers structure their pricing this way because generating new text requires significantly more GPU compute power than simply reading text.