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kWh to CO2 Calculator
Verified formula Updated Jun 2026 Private — runs on your device
Verified formula
Private
CO₂ emissions
410.0
- Trees to offset (per year)
- 19.5
For general information only — not financial, tax, legal or medical advice. Verify before you rely on it.
How to use the kWh to CO2 Calculator
The kWh to CO2 Calculator works out your co₂ emissions, along with 1 related figure in an instant. Enter electricity used and emission factor (kg co₂/kwh) and the result updates as you type — it is free, needs no sign-up, and runs entirely in your browser so your figures stay private.
- Enter the electricity used.
- Enter the emission factor (kg co₂/kwh).
- Read off your co₂ emissions, together with trees to offset (per year) — the calculator updates automatically, with no button to press.
Formula
The kWh to CO2 Calculator uses the formula:
CO₂ emissions = Electricity used × Emission factor (kg CO₂ ÷ kWh)
Worked example
For example, with electricity used of 500 kWh and emission factor (kg co₂/kwh) of 0.82, the co₂ emissions is 410.0.
| Electricity used | 500 kWh |
|---|---|
| Emission factor (kg CO₂/kWh) | 0.82 |
| CO₂ emissions | 410.0 |
|---|---|
| Trees to offset (per year) | 19.5 |
Results are estimates for educational use, not professional advice.
Frequently asked questions
Multiply kWh by the grid emission factor. At 0.82 kg per kWh, using 500 kWh emits about 410 kg of CO₂.
It depends on your region's electricity mix. Coal-heavy grids are higher; renewable-rich grids are much lower. Use a local figure if you have one.
A mature tree absorbs roughly 21 kg of CO₂ a year, so the calculator divides emissions by 21 to estimate trees needed.
Use less energy, switch to efficient appliances, and choose renewable electricity or install solar to lower the effective factor.
The kWh to CO2 Calculator uses the formula: CO₂ emissions = Electricity used × Emission factor (kg CO₂ ÷ kWh). For example, with electricity used of 500 kWh and emission factor (kg co₂/kwh) of 0.82, the co₂ emissions is 410.0.
Enter the electricity used. Enter the emission factor (kg co₂/kwh). Read off your co₂ emissions, together with trees to offset (per year) — the calculator updates automatically, with no button to press.
Related guides
kWh to CO2 Table: CO₂ emissions by Electricity used
Reference table of co₂ emissions for kWh to CO2 across a range of electricity used values — exact, engine-computed figures you can read off at a glance.
How to Calculate kWh to CO2: Formula, Steps & Examples
Learn how to calculate kWh to CO2 — the formula explained step by step, with worked examples and a free calculator to check your answer.