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Token Estimator

Estimate tokens and cost for GPT, Claude, LLaMA and other models

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About This Tool

The Token Estimator helps you size prompts, documents and conversations before sending them to an AI model. It estimates the number of tokens for popular models such as GPT-4o, GPT-4 Turbo, Claude 3.5 and LLaMA 3, shows how much of the context window you would use, and projects approximate API costs. Everything is computed locally — no API keys, no network requests.

Key Features

How to Use

  1. Paste your prompt, document or chat transcript.
  2. Select the model you plan to use.
  3. Read the token count, context usage and cost estimate.
  4. Copy the estimate for your notes or budget sheet.

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Use Cases

token estimate ai cost

Frequently Asked Questions

What is the Token Estimator?

It is a free local tool that estimates how many tokens your text will consume with popular AI models such as GPT-4o, GPT-4 Turbo, Claude 3.5 and LLaMA 3, along with approximate cost projections.

How accurate are the estimates?

The estimates are based on common tokenization patterns: roughly 4 characters per token for English and about 1.6 characters per token for Chinese. They are great for budgeting context windows and API costs, but every tokenizer has its own exact rules.

Does this tool call the AI models?

No. Everything is computed locally in your browser with JavaScript. No API key, no network request and no cost — your text never leaves your device.

Why does token count matter?

Models charge per token and have fixed context windows. Knowing your token count before you send a prompt helps you avoid truncated responses, size your requests, and forecast API spending before committing to a provider.

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