Pevlika Browser Apps

Chat Context Usage Calculator

How many chat turns fit before the context window fills up.

Runs in your browser — nothing is uploaded

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How to use Chat Context Usage Calculator

  1. Enter your values — the unit for each field is shown next to it.
  2. The result updates instantly as you type.
  3. Copy the results, or change inputs to compare scenarios.

Formula & assumptions

Turns = ⌊(window − fixed context − reserve) ÷ tokens per turn⌋

  • Model prices as of 2026-09-30 from the Anthropic, OpenAI and Google pricing pages (standard rates, short prompts). Prices change — check the provider before budgeting.
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