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RAG Chunking Calculator

Plan chunk size and overlap for RAG pipelines.

What Is a RAG Chunking Calculator?

The RAG Chunking Calculator helps plan chunking strategies for retrieval-augmented generation pipelines. Given a document's token count, a chunk size, and an overlap, it reports the number of chunks, the effective stride, and the token overhead introduced by overlap.

How to Use This RAG Chunking Calculator

  1. 1
    Paste a document or enter tokensUse the text area for an auto estimate, or type a manual token count.
  2. 2
    Set chunk sizeEnter the target tokens per chunk.
  3. 3
    Set overlapEnter the tokens shared between adjacent chunks.
  4. 4
    Read the planSee chunk count, stride, and total token overhead.

Frequently Asked Questions

Overlap duplicates a slice of a chunk at the start of the next one, preserving context across boundaries. It increases tokens sent but can improve retrieval quality.
Common starting points are 200–500 tokens per chunk. The best value depends on your model's context window and the structure of your documents.
Every chunk is embedded separately, and overlap makes the tokenized total larger than the raw document. The embedding cost calculator accounts for this overhead.

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