What is EV Carbon Savings Calculator?
EV Carbon Savings Calculator helps you compare petrol and EV operating emissions using your grid and fuel factors.
The main result is estimated annual operating emissions saved, with a breakdown of petrol emissions and EV electricity emissions. The formula, example and assumptions below explain how to interpret it.
How to use EV Carbon Savings Calculator
Use the example to get familiar with the form, then enter your own figures. Any rates in the example are illustrative. Check the field labels and units before calculating.
- Gather annual distance (km), petrol vehicle mileage (km/litre), petrol combustion factor (kg CO₂/litre), EV socket energy (kWh/100 km) and grid emissions factor (kg CO₂e/kWh). Use values from the same situation or reporting period.
- Replace the example annual distance with your own value, then complete the other fields. Check the displayed units.
- Select Calculate and read estimated annual operating emissions saved with its result breakdown. Change one input and calculate again to compare a second scenario. Reset restores the original example.
- Enter annual distance in km, at least 0. Decimals are accepted.
- Enter petrol vehicle mileage in km/litre, at least 0.001. Decimals are accepted.
- Enter petrol combustion factor in kg CO₂/litre, at least 0. Decimals are accepted.
- Enter EV socket energy in kWh/100 km, at least 0. Decimals are accepted.
- Enter grid emissions factor in kg CO₂e/kWh, at least 0. Decimals are accepted.
EV Carbon Savings Calculator: a worked example
With the inputs below, the result is 525 kg CO₂e (estimated annual operating emissions saved). Follow the example, then replace these illustrative values with your own.
| Input or output | Example value |
|---|---|
| Annual distance (km) | 15,000 km |
| Petrol vehicle mileage (km/litre) | 15 km/litre |
| Petrol combustion factor (kg CO₂/litre) | 2.31 kg CO₂/litre |
| EV socket energy (kWh/100 km) | 17 kWh/100 km |
| Grid emissions factor (kg CO₂e/kWh) | 0.7 kg CO₂e/kWh |
| Estimated annual operating emissions saved | 525 kg CO₂e |
| Petrol emissions | 2,310 kg CO₂ |
| EV electricity emissions | 1,785 kg CO₂e |
Understanding the EV Carbon Savings result
Read estimated annual operating emissions saved alongside petrol emissions and EV electricity emissions. These describe different parts of the same calculation.
Displayed results use a readable number of decimal places. When checking a result by hand, keep extra precision until the last step. To compare scenarios, change one input at a time and keep the others fixed.
- Example Petrol emissions: 2,310 kg CO₂
- Example EV electricity emissions: 1,785 kg CO₂e
EV Carbon Savings Calculator: assumptions and common mistakes
A useful estimate starts with the right inputs. Check the following assumptions and limits before applying the result to your situation.
- Match factors to your location and reporting period. A result covers the sources you entered, not an independently verified full footprint.
For wider guidance, visit GHG Protocol calculation guidance. The formula and scope of this specific tool are stated on this page.
