How it works.
Token Offset sizes a monthly contribution to cover the energy, water, and carbon behind your AI usage. Most folks pick a usage band; power users can plug in an Anthropic or OpenAI admin key and we'll sample 90 days of real usage to size the number for them. Both halves, the estimation and the math, are documented here so nothing is mysterious.
Sharpen the estimate with a real-usage sample
Optional. Paste an Anthropic or OpenAI admin key and we'll sample 90 days of your real usage to size the monthly offset. Step-by-step setup, what we read (and what we never see), and the roadmap for Cursor + Gemini. Consumer apps (Claude.ai, ChatGPT, Codex) aren't covered yet.
The math, with receipts
The four constants behind every estimate, the studies behind each constant, an interactive sliding scale, and a transparent breakdown of how much AI different user types actually use.
- Energy
- 0.50 Wh / 1k
- CO₂e
- 0.6 g / 1k
- Rate
- 25c / 1M
Algorithm constants last revised · See methodology for full changelog