Context Window Budget Planner
Token counters give you a number. This tells you whether your document actually fits before the model starts truncating it. Paste your text or enter a word count and pick a context window size. Nothing uploaded.
Estimated tokens ?
% of context window used
Room left
Document copies that fit
Custom context size
Results
Tokens used
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Room left
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Copies that fit ?
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% of window used
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Context Window Usage
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A Note On Accuracy
This tool estimates tokens using a rough ratio of 1.33 tokens per word. Actual tokenization varies by model, language, and content type (code and non-English text often tokenize less efficiently than plain English prose). Use this as a planning estimate, not an exact count.