Estimates CO2 emissions from electricity consumption based on a grid emission factor — how much CO2 is released generating each kilowatt-hour.
How it works
Electricity used (in kWh) is multiplied by the grid’s emission factor (kg CO2 per kWh) to give total estimated emissions.
What this does not include
This does not include the dollar cost of that electricity — for that, use this site’s electricity cost calculator instead. Grid emission intensity varies enormously by region and energy mix, so the default factor is only a rough national average.
How to use this calculator
- Enter your electricity usage in kWh and, if known, your local grid’s specific emission factor.
Frequently asked questions
Why does the emission factor vary so much by region?
Because different regions generate electricity from very different energy mixes — a coal-heavy grid emits far more CO2 per kWh than a grid powered mostly by hydro, nuclear, or renewables.
Where can I find my local grid’s actual emission factor?
Many utilities and national energy agencies publish regional grid emission factors — check your utility’s sustainability reporting or a national energy agency’s published figures.
Does using less electricity always reduce my carbon footprint?
Yes, proportionally — since this is a direct multiplication, cutting electricity use by a given percentage cuts the estimated emissions by that same percentage.
