Emissions per kWh depend on how your country generates power: coal-heavy grids emit far more than hydro or nuclear grids.
How to use the Electricity Carbon Footprint Calculator
- Electricity used per month
- Grid emission factor — About 0.4 is near the world average; check your utility or national data.
Results update as you type, and every field accepts the units shown in its menu.
How it works
Multiply electricity used by the emission factor for your grid.
Inputs explained
| Field | What to enter |
|---|---|
| Electricity used per month | In kWh |
| Grid emission factor | In kg CO₂/kWh. About 0.4 is near the world average; check your utility or national data. |
What each result means
- CO₂ per month = [Electricity used per month]×[Grid emission factor]
- CO₂ per year = [CO₂ per month]×12
Example values
How the main result changes when Electricity used per month changes and everything else stays at the example values above:
| Electricity used per month (kWh) | CO₂ per month (kg) |
|---|---|
| 150 | 60 |
| 225 | 90 |
| 300 | 120 |
| 375 | 150 |
| 450 | 180 |
| 600 | 240 |
Formula
CO₂ = kWh × grid emission factorWorked example
Inputs — Electricity used per month: 300 kWh; Grid emission factor: 0.4 kg CO₂/kWh.
Results — CO₂ per month = 120 kg; CO₂ per year = 1,440 kg.
Frequently asked questions
Where do I find my grid’s factor?
National energy agencies and utilities publish them; the IEA reports factors by country.
Does rooftop solar count?
Subtract the solar energy you use from kWh.
What formula does the Electricity Carbon Footprint Calculator use?
CO₂ = kWh × grid emission factor.