Carbon Offset Calculator
Enter energy consumption and flights to see emissions and offset cost.
Total annual emissions
β
Enter values above
Electricity emissions
β
Gas emissions
β
Flight emissions
β
Offset cost
β
Emissions per month
β
Worked example
With the default inputs shown below, this calculator returns the following results:
| Input | Value |
|---|---|
| Annual electricity use (kWh) | 5000 |
| Electricity factor (kg COβ/kWh) | 0.4 |
| Annual gas use (kWh) | 10000 |
| Gas factor (kg COβ/kWh) | 0.18 |
| Return flights per year | 2 |
| COβ per return flight (tonnes) | 1 |
| Offset price ($/tonne) | 25 |
| Result | Value |
|---|---|
| Total annual emissions | 5.8 tonnes |
| Electricity emissions | 2 t |
| Gas emissions | 1.8 t |
| Flight emissions | 2 t |
| Offset cost | $145 |
| Emissions per month | 0.5 t |
Values shown are produced by this page in your browser; change any input to update them.
How to use the Carbon Offset Calculator
- Annual electricity use (kWh) β default 5000
- Electricity factor (kg COβ/kWh) β default 0.4
- Annual gas use (kWh) β default 10000
- Gas factor (kg COβ/kWh) β default 0.18
- Return flights per year β default 2
- COβ per return flight (tonnes) β default 1
- Offset price ($/tonne) β default 25
- Press Calculate to update the results instantly.
Frequently asked questions
In the United States, average household emissions run around 14β20 tonnes of CO2 a year once electricity, heating and travel are included. A single return long-haul flight can add one to two tonnes.
After. Offsets are the last step: cut what you can first, then offset the remainder with verified schemes. Offsetting without reducing simply pays for the status quo.
Verified standards such as Gold Standard or Verra, additionality, permanence and no double counting. Cheap offsets are often cheap because the underlying project would have happened anyway.