RAG Chunk Size Calculator

Optimize vector store retrieval with data-driven chunk sizing

LLM Context Window (tokens):

Enter Custom Context Window:

Embedding Model:

Chunk Overlap (%):

20%

Average Tokens per Word: (Typically 1.2-1.4 for English)

Expected Retrieved Chunks: Number of chunks to retrieve per query

Recommended Chunk Size

Optimal Chunk Size

512

tokens (approximately 400 words)

Characters 2560

Overlap Size 102 tokens

Effective Chunk Size 410 tokens

Context Window Utilization

Total context after retrieval:

60%

2560 / 8192 tokens

Retrieval Configuration

Chunks Retrieved 5

Total Retrieved Tokens 2560

Available for User/System 5632

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