Calculating your co₂ emissions is straightforward once you know the kWh to CO2 formula and what each input means. This guide explains the method in plain language, walks through a manual calculation, and gives worked examples you can follow — then you can do it instantly with the kWh to CO2 Calculator.
What is kWh to CO2?
The kWh to CO2 calculation tells you your co₂ emissions from a few simple inputs. The figure you are solving for here is the co₂ emissions.
The kWh to CO2 formula
The core formula is:
CO₂ emissions = Electricity used × Emission factor (kg CO₂ ÷ kWh)Here is what each input means:
- Electricity used — a value measured in kWh. Example: 500 kWh.
- Emission factor (kg CO₂/kWh) — a number. Example: 0.82.
How to calculate it step by step
- Write down the electricity used (for example, 500 kWh).
- Write down the emission factor (kg co₂/kwh) (for example, 0.82).
- Apply the formula above to get your co₂ emissions.
- Double-check the result with the kWh to CO2 Calculator.
Worked examples
Example 1
| Input / Output | Value |
|---|---|
| Electricity used | 500 kWh |
| Emission factor (kg CO₂/kWh) | 0.82 |
| CO₂ emissions | 410.0 |
| Trees to offset (per year) | 19.5 |
With electricity used of 500 kWh and emission factor (kg co₂/kwh) of 0.82, the co₂ emissions works out to 410.0.
Example 2
With electricity used of 1,000 kWh and emission factor (kg co₂/kwh) of 0.82, the co₂ emissions works out to 820.0.
| Result | Value |
|---|---|
| CO₂ emissions | 820.0 |
| Trees to offset (per year) | 39.0 |
Example 3
With electricity used of 250 kWh and emission factor (kg co₂/kwh) of 0.82, the co₂ emissions works out to 205.0.
| Result | Value |
|---|---|
| CO₂ emissions | 205.0 |
| Trees to offset (per year) | 9.8 |
Tips for an accurate result
- Keep your units consistent — mixing, say, months with years or grams with kilograms is the most common source of error.
- Round only at the very end. Rounding inputs early can shift the final answer noticeably.
- Re-run the numbers whenever an input changes, rather than estimating from an old result.
Prefer not to do the maths by hand? — the kWh to CO2 Calculator does it instantly, for free, with the formula and a worked example built in.
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