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kWh to CO₂ calculator

Estimate the CO₂ emissions from electricity use and a grid emission factor.

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The kWh to CO₂ calculator turns Electricity used (kWh), Grid factor (g CO₂/kWh) into CO₂ emissions (kg), instantly and for free. For instance, with Electricity used (kWh) = 300 and Grid factor (g CO₂/kWh) = 300 it returns CO₂ emissions (kg) = 90.

How to use it

  1. Enter your values: Electricity used (kWh), Grid factor (g CO₂/kWh).
  2. Read the result instantly: CO₂ emissions (kg).

Frequently asked questions

How does the kWh to CO₂ calculator work?

It takes Electricity used (kWh) and Grid factor (g CO₂/kWh) and derives CO₂ emissions (kg) from them. The calculation is live as you type, so the result updates on every change.

Which values does the calculator ask for?

2 values: Electricity used (kWh) and Grid factor (g CO₂/kWh). Nothing else is required — no account, no file upload.

What does a typical calculation look like?

With Electricity used (kWh) = 300 and Grid factor (g CO₂/kWh) = 300, the calculator returns CO₂ emissions (kg) = 90. Those figures come from running this exact tool, so you can reproduce them by entering the same values.

How much does the result change with different inputs?

It moves a lot. Using Electricity used (kWh) = 600 and Grid factor (g CO₂/kWh) = 600 instead, CO₂ emissions (kg) goes from 90 to 360 — which is why it is worth testing a few scenarios rather than trusting a single figure.

What does it give for smaller values?

Scaled down to Electricity used (kWh) = 150 and Grid factor (g CO₂/kWh) = 150, CO₂ emissions (kg) comes out at 22.5. The relationship is worth checking at both ends before you rely on a single result.

When would I actually use this?

Putting a number on a bill: what an appliance costs to run, whether a solar array covers the load, and how much heating a room actually needs.

What is the most common mistake?

Confusing power with energy. A kilowatt is a rate and a kilowatt-hour is a quantity; a 2 kW heater on for half an hour uses 1 kWh, and only the second figure appears on a bill.

What is the difference between the kWh to CO₂ calculator and the Heat pump savings calculator?

This one returns CO₂ emissions (kg); the Heat pump savings calculator returns Heat actually needed (kWh/year) and Electricity the heat pump draws (kWh/year). That is the whole difference — open the one whose figure you need.

Is there a tool for the next step?

Appliance running cost calculator is the closest one after this: Estimate what an appliance costs to run per day, month and year.

What else is worth having open alongside it?

Solar battery size calculator and Solar panel calculator — they come up in the same task often enough to be worth a second tab.

Further reading

All guides →
How-toHow to Convert kWh to CO₂: Grid Emission Factors ExplainedConvert electricity in kWh into CO₂ emissions using your grid's emission factor — and understand why that factor differs so much by country and time.How-toWhat Size Solar Battery Do I Need? Sizing by Daily UseSize a solar battery from your daily energy use, the days of autonomy you want, and the battery's usable depth of discharge.How-toHow Many Solar Panels Do I Need? A Simple Sizing MethodSize a solar array from your annual electricity use, panel wattage, and local sun hours — plus a quick payback estimate in dollars.GuideIs Crypto Mining Profitable? Electricity, Hashrate and DifficultyMining profit is daily revenue minus daily power cost, and the electricity price decides it. Here is the calculation, a break-even table, and the three variables that move against you.ComparisonSolar Panels: the Self-Consumption Rate Decides the PaybackSince June 2026 a French rooftop is paid 1.1 cents for an exported kilowatt-hour and avoids 25.61 cents by consuming the same one. That ratio of 23 to 1 makes the self-consumption rate — the variable almost every quote omits — worth more than the amount of sun falling on the roof.How-toHow Much Does a Space Heater Cost to Run?Multiply the heater's kilowatts by hours used and your price per kWh — a 1.5 kW heater for 5 hours a day adds up fast at typical tariffs.