What is context engineering?
Select and manage the information available to a model.
AI Engineering tool
Context Budget Calculator
Estimate how instructions, retrieved material, and reserved output consume an AI context window.
Runs in your browser with editable illustrative assumptions. It does not call a model, send entered content to a server, or produce a current market quote.
Interactive calculator
Context budget calculator
tokens
tokens
tokens
tokens
Your request uses 19,200 tokens before any conversation history or tool output is added.
Remaining input budget124,800 tokens
Window used15.0%
This is a planning budget, not a provider-specific guarantee. History, tool results, hidden reasoning, and provider limits can change the usable allowance.
Starting values are illustrative defaults you can edit — not live ComputeTape Market benchmark prices. Replace them with a real quote.
How to use it
Make the assumption visible
Reserve output before filling the input budget. A large context window is not a reason to send every document, history item, or tool result.
- Change one assumption at a time when comparing designs.
- Record the prompt, workload, or permission version beside the result.
- Treat the output as a planning aid and validate it against representative work before making a production decision.