How this calculator works
Enter retrieved documents, tokens per chunk, prompt overhead tokens, context limit tokens. Select Calculate to apply the displayed formula and review the labeled results.
Formula / method
Budget = context limit − prompt overhead; retrieved tokens = documents × tokens per chunk
Worked example
12 chunks of 700 tokens plus 1,800 prompt tokens use 10,200 of a 16,000-token context.
Assumptions and limitations
Every retrieved chunk has the entered average token length.
Tokenization, reranking, citations, tools and response reservation can change the real budget.