EV Carbon Offset Calculator
See exactly how much CO2 you save by switching to electric. Accounts for your local grid emissions, annual mileage, running cost savings, and financial break-even point.
Grid Scenario Analysis
| Scenario | EV CO₂/yr | vs Gas Car | CO₂ Saved |
|---|---|---|---|
| ★ Current Grid (US Average) | 1,297 kg | 3,809 kg | 2,512 kg |
| 50% Renewable Grid | 648 kg | 3,809 kg | 3,160 kg |
| 100% Renewable Grid | 67 kg | 3,809 kg | 3,742 kg |
Key Insights
- Switching to an EV on the US Average grid saves 2,512 kg of CO₂ per year — equivalent to planting ~120 trees annually.
- At 3.50 $/gal gas and 0.13 $/kWh electricity, you save approximately $1,063/year on fuel — $8,506 over 8 years.
- With a $5,000 EV price premium, the break-even point is 4.7 years through fuel savings alone — before accounting for lower maintenance costs.
How to Use the EV Carbon Offset Calculator
- 1
Enter your annual mileage
Input how many miles or kilometres you drive each year. Your car odometer or insurance renewal document is a good source.
- 2
Select your current vehicle
Choose your petrol or diesel vehicle type and enter its fuel efficiency (MPG or L/100km) to set the comparison baseline.
- 3
Select the EV and your country
Choose the electric vehicle you are comparing and select your country to apply the correct electricity grid carbon intensity.
- 4
Review your savings
See annual CO2 savings, equivalent trees offset, annual fuel cost savings, and the financial break-even point in years.
Key Features
Grid-Accurate Emissions
Uses country-specific electricity grid carbon intensity so your EV comparison reflects the actual CO2 from your local power supply.
Financial Break-Even
Calculates how many years until lower EV running costs offset the higher purchase price, giving you the full financial picture.
Trees Equivalent
Converts your annual CO2 saving into a tangible trees-planted equivalent to make the environmental benefit concrete.
Pro Tips
If you charge primarily from home solar or a 100% renewable tariff, your EV emissions are effectively zero - the grid intensity figure does not apply.
The break-even calculation assumes average mileage. If you drive significantly more than average, the financial break-even comes much sooner.
Remember that EV servicing costs are typically 30-40% lower than petrol cars due to fewer moving parts, which is not always factored into simple fuel comparisons.
Privacy Note
All calculations run entirely in your browser — no data is sent to any server. Your inputs are never logged, stored, or shared. This tool is completely free with no account or registration required.
Frequently Asked Questions
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