Where do I find my grid's emission factor?

National energy or environment agencies publish annual grid factors, and some real-time services show the current figure by the hour. Your electricity provider may also list it.

Should I use production or consumption factors?

Consumption-based factors include electricity imported from neighboring grids and are usually more accurate for a household. If only a production figure is available, it's still a reasonable estimate.

Does the factor include the full life cycle?

Most quoted factors count only emissions from burning fuel to generate power. Full life-cycle figures, which add building and fuel-supply emissions, are higher — check which basis a source uses.

How much CO₂ does an average home cause?

It depends on both usage and the grid. The same 4,000 kWh a year produces very different totals — perhaps under 300 kg on a clean grid but well over 2 tonnes on a coal-heavy one.

How to Convert kWh to CO₂: Grid Emission Factors Explained

Published 2/6/2026 · 3 min read · Everyday calculators

Marco Bianchi — Home, DIY & motoring writer at Allin

Renovation · Materials

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In short

Multiply your electricity use in kWh by your grid's emission factor, expressed in grams of CO₂ per kWh, then divide by 1,000 to get kilograms. For example, 500 kWh × 300 g/kWh ÷ 1,000 = 150 kg of CO₂. The emission factor varies enormously by country and even by hour, so use a local figure rather than a global average.

A rooftop array of solar panels in sunlight. — Elite Power Group · Pexels · Pexels

Convert electricity in kWh into CO₂ emissions using your grid's emission factor — and understand why that factor differs so much by country and time.

What a grid emission factor is

A grid emission factor tells you how much carbon dioxide is released, on average, to generate one kilowatt-hour of electricity in a given place. It's usually stated in grams of CO₂ per kWh. The number reflects the mix of sources feeding the grid — coal and gas push it up, while wind, solar, hydro, and nuclear pull it down.

Why the factor varies so much

There is no single correct number to plug in, because the emission factor depends entirely on where and when the electricity was made. A country running mostly on hydro or nuclear may sit well under 100 g CO₂ per kWh, while one leaning on coal can exceed 600 or 700. This is why a global average badly misrepresents any specific home — always look up the figure for your own grid.

The factor also shifts through the day and season. When wind and solar are plentiful, the same kilowatt-hour carries far less carbon than at a still, dark evening peak met by gas plants. Time-of-use carbon data lets you shift flexible loads — laundry, charging, dishwashing — to cleaner hours.

Putting the number to use

Once you can convert kWh to CO₂, you can compare choices in the same units. You can see how much carbon a solar array avoids, weigh switching an appliance to an efficient model, or judge whether a heat pump beats a gas boiler on your specific grid. The conversion turns an abstract bill into a concrete climate figure you can act on.

Worked with our own calculator

kWh to CO₂ calculator

Given

Electricity used (kWh): 300
Grid factor (g CO₂/kWh): 300

Result

CO₂ emissions (kg): 90

These figures are produced by the calculator below, not typed in by hand — they are recomputed whenever the tool changes.

Run it on your own figures →

Frequently asked questions

Where do I find my grid's emission factor?: National energy or environment agencies publish annual grid factors, and some real-time services show the current figure by the hour. Your electricity provider may also list it.
Should I use production or consumption factors?: Consumption-based factors include electricity imported from neighboring grids and are usually more accurate for a household. If only a production figure is available, it's still a reasonable estimate.
Does the factor include the full life cycle?: Most quoted factors count only emissions from burning fuel to generate power. Full life-cycle figures, which add building and fuel-supply emissions, are higher — check which basis a source uses.
How much CO₂ does an average home cause?: It depends on both usage and the grid. The same 4,000 kWh a year produces very different totals — perhaps under 300 kg on a clean grid but well over 2 tonnes on a coal-heavy one.

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