Free LLM CO2 Emission Calculator
Estimate the CO2 emission and electricity usage (kWh) of a single LLM prompt run. Understand how model choice, token volume, and reasoning level affect the environmental impact of your AI usage.
Frequently Asked Questions
What is this free LLM prompt CO2 calculator?
It’s a free calculator that estimates the CO2 emission and electricity (kWh) of a single LLM prompt run. It helps you understand how model choice, token volume, and reasoning level affect impact.
How does the LLM prompt calculator estimate CO2 emission?
The calculator estimates tokens from your prompt text (roughly characters ÷ 4), adds the chosen output tokens, and then applies model‑specific energy factors. The result is converted into CO2 emission using a benchmark carbon‑intensity factor.
Is this CO2 calculator accurate for every LLM?
It’s an estimate based on public benchmarks and simplified assumptions. Actual CO2 emission varies by provider, hardware, and prompt structure, so consider results directional rather than exact.
What does “kWh per run” mean in this LLM calculator?
It’s the estimated electricity used for one prompt/response. The calculator then converts that energy into CO2 emission.
Why is the carbon intensity fixed in this calculator?
This free calculator uses a fixed benchmark carbon‑intensity factor so results stay consistent and comparable. A regional selector can be added later.
Does this free LLM prompt calculator store my prompts?
No. The prompt text is processed in your browser only. Nothing is sent or stored.
How can I lower CO2 emission from an LLM prompt?
Use a smaller model, lower reasoning level, shorter prompts, and smaller max output tokens. The calculator helps you see how each change reduces emissions.
Can I use this calculator for multiple prompts or batch use?
Yes, you can run multiple prompts one by one. For batch estimates, multiply the per‑prompt CO2 emission by your expected volume.