Overlap Calculator
Calculate optimal chunk overlap for RAG
Overlap Visualization
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What is Chunk Overlap?
When splitting documents into chunks for RAG, overlap is the number of tokens shared between adjacent chunks. It ensures important context at chunk boundaries isn't lost during retrieval.
This calculator helps you understand the trade-offs between overlap percentage, storage overhead, and retrieval quality.
Key Concepts
Effective Stride
The actual step size between chunk starts. Stride = Chunk Size - Overlap.
Token Overhead
Extra tokens stored due to overlap. More overlap = more storage and embedding costs.
Recommended Settings
| Use Case | Overlap |
|---|---|
| General text | 10-15% |
| Complex reasoning | 15-25% |
| Code / structured | 5-10% |
FAQ
Can I have zero overlap?
Yes, but you risk splitting important context at chunk boundaries, potentially hurting retrieval quality.