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RAG Retrieved Context Packing

Budget retrieved chunks after reserving instructions, user question and response.

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01 Your input
02 Your result
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FormulaWhole chunks fitting context = Math.floor((window-fixed-answer)/(chunk+meta)); Unused token reserve = (window-fixed-answer)%(chunk+meta)

Made for real tasks

  • Budget retrieved chunks after reserving instructions, user question and response.
Explore step-by-step workflows →

Worked example

Inputs

Model context window
16000 tokens
Prompt and question overhead
2000 tokens
Reserved response
2000 tokens
Tokens per retrieved chunk
600 tokens
Metadata tokens per chunk
40 tokens

Expected results

Whole chunks fitting context
18 chunks
Unused token reserve
480 tokens

Load the example in the workspace to reproduce these results. Display rounding does not change the underlying calculation.

How to use this tool

  1. Enter model context window, prompt and question overhead, reserved response, tokens per retrieved chunk, metadata tokens per chunk in the displayed units.
  2. Calculate the scenario, then compare it with measurements before changing a system.

Try this example

{
  "window": 16000,
  "fixed": 2000,
  "answer": 2000,
  "chunk": 600,
  "meta": 40
}

Accuracy and scope

Fixed token lengths; not semantic retrieval quality or exact tokenizer behavior.

Is my data uploaded?

This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.