How to Calculate CO2 Emissions from Electricity
CO2 = electricity (kWh) x emission factor. Using the Japan average 0.434 kg-CO2/kWh, 300 kWh/month emits 300 x 0.434 = about 130 kg of CO2.
Open the interactive Everyday Lifestyle tool →Formula: CO2 = kWh x factor
Key facts
| Formula | CO2 = kWh x factor |
|---|---|
| JP grid factor | 0.434 kg-CO2/kWh |
| 300 kWh/month | ~130 kg CO2 |
| City gas factor | 2.23 kg-CO2/m3 |
Frequently asked questions
How much CO2 does 300 kWh produce?
About 130 kg: 300 x 0.434 kg-CO2/kWh (Japan grid average).
What is the emission factor for gas?
City gas is about 2.23 kg-CO2/m3, so 30 m3 emits about 66.9 kg.
Why does the factor vary?
It depends on the generation mix; the 0.434 value is a national average and changes yearly.
Related pages
CO2 from Electricity Calculator is part of Everyday Lifestyle on GOAT Lab — a free reference you can use without signing up, and it works offline. Open the tool above for any custom value.
Part of GOAT Lab — 26 free, browser-based science, engineering and developer tools. No sign-up.