Free tool
Gemini context window calculator
Plan source, prompt, and answer room for Gemini before exporting a large AI context bundle.
Gemini 2.5 Pro budget planner
Gemini 2.5 Pro supports a 1M-token context window and up to 65K output tokens.
Used 0
Remaining 0
Status Ready
Source: Google documentation. Last reviewed 2026-06-05.
Frequently asked questions
What Gemini models does this calculator cover?
It shows Gemini 2.5 Pro and Gemini 2.5 Flash, both with 1M-token context windows. Select a variant to plan your specific budget.
Does a huge Gemini window mean I should upload everything?
No. Large windows help, but irrelevant files still create noise. Curated context remains better than a full project dump.
Can Riflet build a Gemini Gems context file?
Yes. Riflet can export a portable Markdown or text bundle from mixed sources that you can use with Gemini workflows.
Can I change the numbers?
Yes. The calculator fields are editable so you can plan around the specific Gemini model or product limit you use.