AI Token Calculator
Paste any text to instantly count tokens for ChatGPT, Claude, and Gemini. Free, no signup, runs in your browser.
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Estimated API cost
What are AI tokens?
Tokens are the units AI models use to process text — roughly 1 token ≈ 4 characters or ¾ of a word in English. API pricing is based on how many tokens you send (input) and receive (output).
How accurate is this calculator?
We use a cl100k-style approximation (4 chars/token) which matches GPT-4o and Claude within ~5% for typical English text. For exact counts, use the official tiktoken library.
Why does token count matter?
Context windows (how much text a model can "see") are measured in tokens. Staying under the limit avoids truncation — and estimating cost before a large API call saves money.
How many tokens is 1000 words?
Approximately 1,300–1,500 tokens for standard English prose.