AI Calculator
RAG chunk size calculator
Pick chunk size, overlap, and retrieval count based on document type and context window.
Best for: Knowledge bases, enterprise documents, support docs, and technical search
There is no universal best chunk size. The calculator now estimates overlap, topK, corpus chunk count, and prompt budget.
Chunk
600
tokens
Overlap
90
tokens
TopK
8
Corpus chunks
424
Prompt budget
4,800
tokens
Suggested starting parameters
Start with chunk=600, overlap=90, topK=8.
If answers miss facts, raise topK first. If answers mix unrelated facts, reduce chunk size or add reranking.