Words to Tokens Calculator

Enter a word count to estimate tokens for each model family.

Runs in your browser — nothing is uploaded
I have

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How to use Words to Tokens Calculator

  1. Enter your values — the unit for each field is shown next to it.
  2. The result updates instantly as you type.
  3. Copy the results, or change inputs to compare scenarios.

Formula & assumptions

GPT ≈ 0.75 words or 4 characters per token (English)

Claude (current tokenizer) ≈ 0.555 words or 2.5 characters per token