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EV vs Petrol Emission Calculator

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Compare electric vehicle and petrol car CO₂ emissions using annual driving distance, EV energy consumption, charging losses, electricity carbon intensity and petrol fuel economy. Calculate CO₂ per km, annual emissions, lifetime emissions, carbon savings, charging cost, petrol cost and optional lifecycle carbon payback.

Inputs

1

1 — Driving & Vehicle Efficiency

Enter the distance each vehicle would travel in one year. Use the same annual distance for both vehicles so the comparison is fair.

Use real-world electricity consumption where possible. Include normal driving conditions rather than relying only on laboratory test figures.

Use realistic real-world petrol consumption. Lower L/100 km means lower petrol CO₂ emissions per kilometre.

2

2 — EV Charging & Electricity

Enter the carbon intensity of the electricity used for charging. This is one of the most important inputs in an EV emissions comparison.

Charging losses account for electricity drawn from the supply being higher than the energy stored in the battery.

Cost calculation only. CO₂ calculations use the grid carbon intensity entered above.

Enter your actual residential electricity rate if you want EV charging cost estimates.

3

3 — Petrol Fuel

Reference default: 2.31 kg CO₂/L. Replace this with the factor required by your reporting methodology when necessary.

Optional running-cost input. It does not affect the CO₂ calculation.

4

4 — Lifetime & Lifecycle Analysis

Operational mode compares driving-related emissions. Lifecycle mode additionally uses your supplied manufacturing and battery-production assumptions.

How to use this calculator: EV vs Petrol Emission Calculator

Compare electric vehicle and petrol car CO₂ emissions using annual driving distance, EV energy consumption, charging losses, electricity carbon intensity and petrol fuel economy. Calculate CO₂ per km, annual emissions, lifetime emissions, carbon savings, charging cost, petrol cost and optional lifecycle carbon payback. The example below is calculated by this page's real engine from the displayed inputs.

  1. 1Enter how many kilometres the vehicle is expected to travel in one year. Use the same annual distance for both vehicles. A fair comparison must compare the same amount of travel.
  2. 2Enter the EV's real-world electricity consumption in kWh/100 km. If you have a manufacturer figure, consider adjusting it to reflect your actual driving conditions, climate, speed and accessory loads.
  3. 3Enter the petrol vehicle's realistic fuel consumption in L/100 km. Do not mix a laboratory EV figure with a real-world petrol figure because that can distort the comparison.
  4. 4Enter the carbon intensity of the electricity used for EV charging in g CO₂/kWh. This is one of the most important inputs because the same EV can have very different operational emissions on different electricity grids.
  5. 5Enter the approximate percentage of charging electricity lost between the electricity supply and energy stored in the battery. This prevents the calculation from treating battery energy as if it were identical to electricity drawn from the grid.
  6. 6Choose home, public or blended charging if you also want running-cost results. For blended charging, enter the percentage of charging performed at public chargers.
  7. 7The calculator starts with 2.31 kg CO₂/L as the reference petrol factor used elsewhere in the Environment & Energy calculators. Replace it when your reporting framework requires another factor.
  8. 8The calculator converts EV electricity use and grid carbon intensity into g CO₂/km. This is the most useful direct comparison metric because both vehicles are now expressed per kilometre.
  9. 9Petrol emissions are calculated from fuel consumption and the selected petrol emission factor. The result is displayed using the same g CO₂/km basis as the EV.
  10. 10The calculator multiplies the per-kilometre results by your annual distance and reports annual EV emissions, annual petrol emissions, annual CO₂ saved and percentage reduction.
  11. 11If you supplied electricity and petrol prices, the calculator compares annual EV charging cost with annual petrol fuel cost and reports the estimated annual running-cost difference.
  12. 12Lifecycle mode allows you to add vehicle manufacturing and battery-production emissions. Do not invent these values: use a documented lifecycle source and keep the boundary consistent between the EV and petrol vehicle.
  13. 13When lifecycle manufacturing inputs are available, the calculator estimates how many kilometres the EV needs to travel before its lower operational emissions offset its additional embodied manufacturing emissions.
  14. 14Change the electricity carbon intensity and recalculate. This shows how strongly the EV result depends on the electricity used for charging and is particularly useful when comparing home solar, renewable electricity and a carbon-intensive grid.

Input guide and example values

Use values from the same measurement basis and time period. Conditional fields appear only when the related option is selected.

InputExample valueWhy it matters
Annual driving distance15000 km/yearEnter the distance each vehicle would travel in one year. Use the same annual distance for both vehicles so the comparison is fair.
EV energy consumption18 kWh/100 kmUse real-world electricity consumption where possible. Include normal driving conditions rather than relying only on laboratory test figures.
Petrol fuel economy7 L/100 kmUse realistic real-world petrol consumption. Lower L/100 km means lower petrol CO₂ emissions per kilometre.
Electricity carbon intensity710 g CO₂/kWhEnter the carbon intensity of the electricity used for charging. This is one of the most important inputs in an EV emissions comparison.
EV charging losses10 %Charging losses account for electricity drawn from the supply being higher than the energy stored in the battery.
Charging electricity costHome chargingCost calculation only. CO₂ calculations use the grid carbon intensity entered above.
Home electricity tariff8 currency/kWhEnter your actual residential electricity rate if you want EV charging cost estimates.
Petrol CO₂ emission factor2.31 kg CO₂/LReference default: 2.31 kg CO₂/L. Replace this with the factor required by your reporting methodology when necessary.
Petrol price100 currency/LOptional running-cost input. It does not affect the CO₂ calculation.
Emission analysisOperational / use-phase emissionsOperational mode compares driving-related emissions. Lifecycle mode additionally uses your supplied manufacturing and battery-production assumptions.

Formula, derivation and worked example

This calculator compares an electric vehicle and a petrol vehicle on a common distance basis. The core operational comparison converts EV electricity consumption and petrol fuel consumption into g CO₂/km, then annualises the results using the same annual driving distance. The EV result depends strongly on electricity carbon intensity and charging losses; the petrol result depends on real-world fuel economy and the selected petrol emission factor. An optional lifecycle mode allows users to add documented vehicle-production and battery-production assumptions and estimate a carbon payback distance. This is deliberately an adjustable scenario calculator rather than a universal claim that every EV has the same emissions profile.

EV electricity before charging losses = Annual km × EV kWh/100 km ÷ 100
EV electricity from grid = EV battery energy ÷ (1 − charging loss)
EV operational CO₂ = Grid electricity × Grid carbon intensity
EV CO₂ per km = EV electricity per km × Grid carbon intensity
Petrol litres = Annual km × Petrol L/100 km ÷ 100
Petrol CO₂ = Petrol litres × Petrol emission factor
Petrol CO₂ per km = Petrol L/100 km × Petrol emission factor
Annual CO₂ saving = Petrol annual CO₂ − EV annual CO₂
CO₂ reduction % = Annual CO₂ saving ÷ Petrol annual CO₂ × 100
Lifetime operational CO₂ = Annual operational CO₂ × Lifetime years
EV embodied CO₂ = EV manufacturing + Battery capacity × Battery manufacturing factor
Lifecycle EV CO₂ = EV embodied CO₂ + EV lifetime operational CO₂
Lifecycle petrol CO₂ = Petrol manufacturing + Petrol lifetime operational CO₂
Carbon payback distance = Additional EV embodied CO₂ ÷ Operational CO₂ saving per km

Substitution steps

  1. 1. EV battery energy
    15,000 km × 18 kWh/100 km ÷ 100
    = 2,700 kWh/year
  2. 2. EV grid electricity
    2,700 ÷ 0.9
    = 3,000 kWh/year
  3. 3. EV annual CO₂
    3,000 kWh × 710 g/kWh ÷ 1,000
    = 2,130 kg CO₂/year
  4. 4. Petrol consumption
    15,000 km × 7 L/100 km ÷ 100
    = 1,050 L/year
  5. 5. Petrol annual CO₂
    1,050 L × 2.31 kg/L
    = 2,425.5 kg CO₂/year
  6. 6. Annual CO₂ saving
    Petrol annual CO₂ − EV annual CO₂
    = 295.5 kg CO₂/year

Computed example results

EV CO₂ emissions
2,130 t CO₂/year
142 g CO₂/km
Petrol CO₂ emissions
2.425 t CO₂/year
161.7 g CO₂/km
Annual CO₂ saved
0.295 t CO₂/year
12.2% lower than petrol
EV operational intensity
142 g CO₂/km
Petrol operational intensity
161.7 g CO₂/km
Annual EV electricity
3,000 kWh/year
Annual petrol consumption
1,050 L/year
EV annual charging cost
24,000 currency/year
Petrol annual fuel cost
105,000 currency/year
Annual running-cost saving
81,000 currency/year

Understanding the result

Read the main result together with supporting checks, assumptions, limits and intermediate values.

For a manual check, repeat the first equation, confirm the units and change one input at a time.

Common mistakes when using EV vs Petrol Emission Calculator

  • Do not mix units for Annual driving distance (km/year), EV energy consumption (kWh/100 km), Petrol fuel economy (L/100 km). A unit mismatch changes the input magnitude even when the typed number looks reasonable.
  • Do not leave Charging electricity cost on the default choice unless that choice matches the real scenario; the selected option can change the calculation path or factor.
  • Do not replace the displayed EV electricity before charging losses = Annual km × EV kWh/100 km ÷ 100 relationship with a different convention without also changing the underlying assumptions; compare like-for-like methods when checking the result.
  • Do not treat EV CO₂ emissions = 2,130 t CO₂/year from the worked example as a universal answer. It belongs to the displayed example inputs and must be recalculated for the actual case.

When the EV vs Petrol Emission Calculator is useful

EV vs Petrol Emission Calculator is designed for cases where Annual driving distance, EV energy consumption, Petrol fuel economy, Electricity carbon intensity are known and you need EV CO₂ emissions, Petrol CO₂ emissions, Annual CO₂ saved. The page keeps the live calculator, calculation method and worked example together so the result can be checked instead of treated as a black-box number.

Use the calculator for the scope described by its inputs and notes. The displayed method is EV electricity before charging losses = Annual km × EV kWh/100 km ÷ 100. If the real project or decision needs factors that are not represented here, treat the result as an estimate and add the missing checks separately.

Annual driving distance and EV energy consumption: what changes the answer

The worked example uses Annual driving distance = 15000 km/year, EV energy consumption = 18 kWh/100 km, Petrol fuel economy = 7 L/100 km, Electricity carbon intensity = 710 g CO₂/kWh. With those values, EV CO₂ emissions is 2,130 t CO₂/year. Changing an input should be interpreted according to that field's unit, range, option and hint rather than by the number alone.

For this calculator, the main input roles are: Annual driving distance (km/year): Enter the distance each vehicle would travel in one year. Use the same annual distance for both vehicles so the comparison is fair. EV energy consumption (kWh/100 km): Use real-world electricity consumption where possible. Include normal driving conditions rather than relying only on laboratory test figures. Petrol fuel economy (L/100 km): Use realistic real-world petrol consumption. Lower L/100 km means lower petrol CO₂ emissions per kilometre. Electricity carbon intensity (g CO₂/kWh): Enter the carbon intensity of the electricity used for charging. This is one of the most important inputs in an EV emissions comparison.

How to sanity-check a EV vs Petrol Emission Calculator result

Start by confirming the entered values and units, then compare the substituted working with the displayed formula or calculation steps. Pay particular attention to EV CO₂ emissions, because it is the first worked-example output shown by the live engine.

Finally, compare the result with the assumptions, warnings and related calculators on this page. A nearby calculator can be useful as a cross-check when it measures the same workflow from a different input or output direction.

Next logical calculator

Continue with Electricity Carbon Emission Calculator

Electricity Carbon Emission Calculator is directly connected from EV vs Petrol Emission Calculator as a source-defined continuation or comparison.

Open Electricity Carbon Emission Calculator

Standards, source trail and limitations

References show the method used. Check the current local edition, amendments and project specification before a regulated decision.

Formula

  • EV electricity before charging losses = Annual km × EV kWh/100 km ÷ 100
  • EV electricity from grid = EV battery energy ÷ (1 − charging loss)
  • EV operational CO₂ = Grid electricity × Grid carbon intensity
  • EV CO₂ per km = EV electricity per km × Grid carbon intensity
  • Petrol litres = Annual km × Petrol L/100 km ÷ 100
  • Petrol CO₂ = Petrol litres × Petrol emission factor
  • Petrol CO₂ per km = Petrol L/100 km × Petrol emission factor
  • Annual CO₂ saving = Petrol annual CO₂ − EV annual CO₂
  • CO₂ reduction % = Annual CO₂ saving ÷ Petrol annual CO₂ × 100
  • Lifetime operational CO₂ = Annual operational CO₂ × Lifetime years
  • EV embodied CO₂ = EV manufacturing + Battery capacity × Battery manufacturing factor
  • Lifecycle EV CO₂ = EV embodied CO₂ + EV lifetime operational CO₂
  • Lifecycle petrol CO₂ = Petrol manufacturing + Petrol lifetime operational CO₂
  • Carbon payback distance = Additional EV embodied CO₂ ÷ Operational CO₂ saving per km

This calculator compares an electric vehicle and a petrol vehicle on a common distance basis. The core operational comparison converts EV electricity consumption and petrol fuel consumption into g CO₂/km, then annualises the results using the same annual driving distance. The EV result depends strongly on electricity carbon intensity and charging losses; the petrol result depends on real-world fuel economy and the selected petrol emission factor. An optional lifecycle mode allows users to add documented vehicle-production and battery-production assumptions and estimate a carbon payback distance. This is deliberately an adjustable scenario calculator rather than a universal claim that every EV has the same emissions profile.

Formulas explained

EV electricity = Annual distance × EV efficiency ÷ 100

EV efficiency is normally expressed as kWh per 100 km. Dividing annual distance by 100 converts the vehicle efficiency figure into annual electricity demand before charging losses.

Annual distance
Total kilometres driven in one year.
EV efficiency
Electricity consumed by the EV in kWh/100 km.

EV grid electricity = Battery energy ÷ (1 − charging loss)

The electricity supplied by the charger is normally greater than the energy stored in the battery because charging and conversion losses occur.

Battery energy
Energy required by the vehicle.
Charging loss
Fraction of supplied charging electricity lost before or during battery charging.

EV CO₂/km = EV kWh/km × grid g CO₂/kWh

This converts electricity consumption into a distance-based emissions intensity. It allows the EV and petrol vehicle to be compared on the same g CO₂/km basis.

EV kWh/km
Electricity drawn per kilometre after charging losses.
Grid carbon intensity
Grams of CO₂ associated with each kWh of charging electricity.

Petrol CO₂/km = Petrol L/100 km × petrol factor ÷ 100

Petrol fuel consumption is converted from litres per 100 km into litres per kilometre and multiplied by the petrol emission factor.

Petrol L/100 km
Fuel consumed over 100 km.
Petrol emission factor
kg CO₂ released per litre under the selected factor.

Annual CO₂ saving = Petrol CO₂ − EV CO₂

Both vehicles are evaluated over the same annual distance, so the difference represents the estimated annual operational CO₂ reduction from switching from the petrol vehicle to the EV.

Petrol CO₂
Annual petrol vehicle emissions.
EV CO₂
Annual EV charging-related emissions.

Carbon payback distance = Embodied CO₂ difference ÷ CO₂ saving per km

An EV can start with higher manufacturing emissions because of battery production. The payback distance estimates when lower operating emissions compensate for that initial difference.

Embodied CO₂ difference
Additional EV manufacturing and battery emissions compared with the petrol vehicle.
CO₂ saving per km
Petrol operational emissions per km minus EV operational emissions per km.

EVs have zero tailpipe CO₂, but charging electricity matters

A battery-electric vehicle does not burn petrol while driving, so it has no tailpipe combustion CO₂. Operational charging emissions depend on how much electricity the vehicle consumes and the carbon intensity of that electricity supply.

Grid carbon intensity can change the EV result

Two identical EVs can have different operational carbon footprints if they charge from different electricity systems. A lower-carbon grid produces a lower charging-related carbon intensity.

Real-world efficiency matters

Using an unrealistic EV consumption value or petrol mileage can materially change the comparison. Temperature, speed, traffic, tyre pressure, vehicle mass, terrain and HVAC use all influence real-world energy consumption.

Charging losses should not be ignored

The electricity stored in the battery is not identical to electricity drawn from the grid. Charger, cable, power-electronics and battery losses mean grid electricity can be higher than battery energy used for driving.

Operational and lifecycle emissions are different questions

Operational comparison looks at emissions associated with driving and charging. Lifecycle comparison additionally considers vehicle and battery manufacturing, fuel production and other stages. Do not compare a tailpipe-only petrol figure with a full-lifecycle EV figure and call them equivalent boundaries.

Battery manufacturing creates an initial carbon burden

Battery production can make EV manufacturing emissions higher than those of a comparable petrol vehicle at the beginning of its life. Lower operating emissions can repay that difference over distance, but the payback depends on the vehicles, battery, electricity mix and methodology.

Vehicle size changes the answer

A large electric SUV and a small petrol hatchback are not an apples-to-apples comparison. Energy consumption, mass, battery size and manufacturing emissions should be considered when comparing specific vehicles.

The electricity factor should be documented

For formal reporting, record the source, geographic boundary, reporting year and methodology behind the electricity emission factor. Do not silently mix location-based and marginal electricity factors.

This is a comparison tool, not a certification

The calculator is intended for estimation, education and scenario analysis. Model-specific lifecycle assessment requires documented vehicle, battery, fuel and electricity data with a defined system boundary.

Electricity Carbon Emission Calculator

Calculate the carbon emissions associated with electricity consumption using a selected electricity emission factor.

Petrol Carbon Calculator

Calculate petrol-related CO₂ emissions from litres consumed, distance and fuel economy.

Diesel Carbon Calculator

Estimate diesel-related CO₂ emissions and compare fuel consumption scenarios.

Household Carbon Footprint Calculator

Estimate household emissions from electricity, LPG and vehicle fuel.

Worked example

  1. 1Example scenario: 15,000 km/year, EV consumption of 18 kWh/100 km, petrol consumption of 7 L/100 km, 710 g CO₂/kWh grid intensity and 10% charging losses.
  2. 2EV electricity before charging losses = 15,000 × 18 ÷ 100 = 2,700 kWh/year.
  3. 3EV grid electricity after 10% charging losses = 2,700 ÷ 0.90 = 3,000 kWh/year.
  4. 4EV operational CO₂ = 3,000 × 710 g/kWh = 2,130,000 g = 2.13 t CO₂/year.
  5. 5EV operational intensity = 2,130,000 ÷ 15,000 = 142 g CO₂/km.
  6. 6Petrol consumption = 15,000 × 7 ÷ 100 = 1,050 L/year.
  7. 7Petrol CO₂ = 1,050 × 2.31 = 2,425.5 kg = 2.426 t CO₂/year.
  8. 8Petrol operational intensity = 2,425,500 ÷ 15,000 = 161.7 g CO₂/km.
  9. 9Estimated annual operational saving = 2,425.5 − 2,130 = 295.5 kg CO₂/year.
  10. 10The result changes if the electricity grid factor, EV efficiency, petrol economy or charging losses change. That sensitivity is a feature, not a problem: it makes the assumptions visible.

Assumptions

  • Both vehicles are assumed to travel the same annual distance.
  • EV electricity consumption is entered as kWh/100 km and is treated as the vehicle's usable driving-energy requirement.
  • Charging losses increase the electricity drawn from the grid above the energy required by the vehicle.
  • The electricity carbon intensity is treated as constant across the selected reporting period.
  • Petrol consumption is represented using the supplied L/100 km value.
  • The default petrol factor is 2.31 kg CO₂/L, but users can replace it with another documented factor.
  • Operational comparison does not automatically include vehicle manufacturing, battery production, fuel extraction or refining unless the selected lifecycle scenario includes documented manufacturing inputs.
  • Lifecycle manufacturing inputs are user-supplied because they vary by vehicle size, battery chemistry, manufacturing location, electricity mix and methodology.
  • Cost results are separate from emissions results and do not affect CO₂ calculations.

Tips

  • Use real-world EV efficiency rather than relying blindly on laboratory test-cycle values.
  • Use the same driving distance for both vehicles.
  • Use the actual electricity carbon intensity relevant to the charging location whenever reliable data is available.
  • Include charging losses when calculating electricity drawn from the grid.
  • For Indian comparisons, use a documented India-specific electricity factor rather than automatically importing a European or US factor.
  • For lifecycle studies, use the same system boundary and GHG accounting basis for both vehicles.
  • Run sensitivity tests using low, medium and high grid carbon-intensity scenarios.
  • Keep manufacturing and battery assumptions documented if the lifecycle mode is used for procurement or sustainability analysis.

Warnings

  • This calculator is an estimate and is not a certified vehicle life-cycle assessment.
  • Do not mix operational, well-to-wheel and full-lifecycle figures without clearly labelling the system boundary.
  • Electricity carbon intensity varies by location, time, methodology and reporting boundary.
  • Battery-production emissions vary substantially by chemistry, manufacturing location and electricity supply.
  • A specific vehicle model can perform differently from a generic efficiency assumption.
  • Formal ESG, regulatory or audited reporting should use documented emission factors, system boundaries and the applicable reporting framework.

Standards & references

  • Life Cycle Assessment principles — ISO 14040 / ISO 14044
  • GHG Protocol — Greenhouse Gas Accounting and Reporting principles
  • IPCC greenhouse-gas accounting methodologies
  • IEA electric-vehicle lifecycle assessment methodology
  • Applicable national electricity emission-factor methodology
  • Applicable national or organisational fuel emission factors

Frequently asked questions

Is an EV really zero-emission?

An EV has no tailpipe combustion emissions while driving, but charging can cause upstream electricity-generation emissions. A complete comparison therefore needs the electricity carbon intensity and EV energy consumption.

How do I calculate EV CO₂ emissions per kilometre?

Convert EV consumption into kWh/km, account for charging losses, then multiply by the electricity carbon intensity in g CO₂/kWh. The result is an estimated operational g CO₂/km.

How do I calculate petrol car CO₂ per kilometre?

Convert petrol consumption from L/100 km into L/km and multiply by the petrol emission factor in kg CO₂/L. Multiply by 1,000 to display the result in g CO₂/km.

What is the EV vs petrol CO₂ formula?

EV CO₂/km = EV kWh/km after charging losses × electricity g CO₂/kWh. Petrol CO₂/km = petrol L/km × petrol kg CO₂/L × 1,000. The difference gives the estimated operational CO₂ saving per kilometre.

Why does electricity carbon intensity matter for EV emissions?

Because EVs consume electricity rather than liquid fuel. A lower-carbon electricity supply produces lower charging-related emissions for the same vehicle efficiency.

Does charging loss affect EV carbon emissions?

Yes. If the vehicle requires a certain amount of battery energy, the grid must normally supply more electricity because charging is not perfectly efficient. The calculator explicitly accounts for this loss.

How much CO₂ can an EV save compared with a petrol car?

There is no single universal number. The result depends on EV efficiency, petrol mileage, annual distance, charging losses and electricity carbon intensity. Use the calculator with your own inputs for a scenario-specific estimate.

Does an EV have manufacturing emissions?

Yes. Vehicle and battery manufacturing create emissions before the vehicle is driven. Lifecycle analysis includes these emissions rather than looking only at driving.

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Engineering disclaimer

Results are estimates for education, planning and scenario comparison. They are not a certified vehicle lifecycle assessment, regulatory carbon inventory or assurance opinion. Verify vehicle-specific efficiency, electricity factors, fuel factors, manufacturing assumptions and lifecycle boundaries before using results for formal reporting or procurement decisions.