AI / LLM

Context Window Calculator

Paste your prompt or conversation to see how many tokens it consumes relative to a given model's context window limit.

Paste your prompt / conversation
Model context window
Estimated tokens0
0.0% of usable window124,000 tokens remaining

This is a heuristic estimate (~4 chars/token, blended with word count), not the exact tokenizer output of any specific model — real counts can differ by 10-20%. Everything runs locally in your browser.

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