From prompt to request cost
Estimated request cost equals input tokens multiplied by $2 per million, plus expected output multiplied by $12 per million. Cached input is separate only when the provider publishes a rate.
Gemini token calculator
Make Gemini context easier to budget.
Measure prompt size, output headroom, and a planning cost for Gemini Pro and Flash routes.
Gemini 3.1 Pro Preview1,000,000token context window
$2 input / 1M $0.2 cached / 1M $12 output / 1M
Official · verified 2026-07-31View provider pricing ↗Standard price for prompts up to 200K; larger prompts are tiered at $4/$18.What this page helps you decide
- See context pressure before a large request fails.
- Choose Pro for quality or Flash for throughput.
- Use the same prompt measurement workflow across providers.
Prices are planning references, not a billing guarantee. Check the provider’s current pricing before launch.
Estimate a Gemini 3.1 Pro Preview request
1,000,000 context
0input tokens · local estimate
$0.0000estimated input cost
$0.0060reserved output cost
$0.0060estimated request total
0.05% of context reserved. Planning estimate based on characters ÷ 4; provider tokenizers and structured requests can differ.
Count the assembled request
System instructions, conversation history, retrieved documents, tool definitions, files, and response length all matter. Use the visible prompt for drafting, then validate the final payload with Google.
Before you rely on the number
Gemini 3.1 Pro Preview calculator questions
Is this Gemini 3.1 Pro Preview token count exact?
No. It is a private plain-text planning estimate. Google tokenization, chat formatting, tools, files, and images can change the real count.
Does the prompt leave my browser?
No. The calculator runs locally in your browser. Only the page itself and published registry data are loaded from PromptCostLab.
How should I verify production cost?
Check the linked Google pricing page, then compare the estimate with token usage returned by the real API request.