AI Token Counter
Estimate the number of tokens in your text for GPT-4, Claude, Gemini, and other LLMs. Useful for staying within context limits.
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How to use this calculator
Most English text tokenizes at roughly 4 characters per token. This is an approximation — actual counts vary by tokenizer, language, and content type.
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Paste or type the text you want to count into the text area.
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Select the model family you are targeting from the dropdown.
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Read the estimated token count and percentage of the context window used.
Frequently asked questions
How accurate is this token counter?
This tool uses the 4-characters-per-token heuristic, which is accurate to within roughly 10–15% for typical English text. For exact counts, use the model provider's official tokenizer (e.g., tiktoken for OpenAI).
Does token count vary by language?
Yes. Non-Latin scripts (Chinese, Arabic, Korean, etc.) often use more tokens per word because characters map less efficiently to the tokenizer vocabulary. Code and special characters can also alter the ratio.
What happens if I exceed the context window?
The model will either return an error or silently truncate the input, depending on the provider and SDK settings. Always leave room for the output tokens as well.
AI Token Counter — Estimate Tokens for GPT-4, Claude & Gemini
Why token counting matters
Every large language model processes text as tokens, not raw characters or words. A token is roughly 4 characters in English, but the exact boundary depends on the model's vocabulary. Knowing your token count before making an API call helps you stay within the model's context window, avoid unexpected truncation, and budget API costs accurately.
Context windows across popular models
GPT-4 supports up to 128,000 tokens, Claude 3 extends to 200,000 tokens, and Gemini 1.5 Pro reaches 1,000,000 tokens. Smaller open-source models like Llama 3 typically top out at 8,000–128,000 tokens depending on the variant. Choosing the right model for your document length is the first step to avoiding context errors.
Learn more from an authoritative source:
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Results are estimates for informational purposes only and do not constitute professional financial, medical, legal, or technical advice. Read full disclaimer →