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LLM Context Window Calculator

Estimate tokens used for a given context length

LLM Context Window Calculator

Context Used (K tokens)
Model

An LLM context window calculator shows how much of a model's context limit a given amount of text consumes, and estimates the input cost. Context window is the maximum text a model can process at once.

  1. 1Context window measured in tokens (1 token ≈ 0.75 words)
  2. 2Input tokens include both the prompt and any prior conversation
  3. 3Exceeding context limit causes earlier content to be forgotten
  4. 4Cost = (context tokens ÷ 1000) × input price per 1K tokens
32K tokens used in 128K model=25% context used, ~$0.08 input cost (GPT-4o)
Full 200K context (Claude)=~150,000 words, ~600 A4 pages
1,000 token conversation=~750 words, minimal cost at most price points
TokensWords (approx)Pages (A4)Cost (GPT-4o)
1K7503$0.003
10K7,50030$0.025
32K24,00096$0.08
128K96,000384$0.32
200K150,000600$0.50
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