EV Carbon Footprint Calculator
How much CO₂ does your electric car actually save? Compare your EV to a gas car by state grid intensity, annual miles, and vehicle — including manufacturing emissions and lifetime breakeven timeline.
Your Details
24.5 kWh/100mi efficiency
Grid: 0.397 lbs CO₂/kWh
Your EV saves 3.3 tons of CO₂ per year
In CA, the Tesla Model 3 Long Range produces 0.5 tons CO₂/year vs 3.8 tons for a 28-MPG gas car.
Lifecycle breakeven (including manufacturing): year 1
Cumulative CO₂ Over Time (tons)
Includes manufacturing CO₂ at year 0 — EV: 9.0 tons, Gas: 6.5 tons.
What Your 10-Year CO₂ Savings Equals
Over 10 years, your EV saves 30.3 tons of CO₂ vs a 28-MPG gas car.
Methodology
EV emissions: kWh/100mi ÷ 100 × state grid CO₂ intensity (lbs CO₂/kWh) × annual miles. Grid data from EPA eGRID2023.
Gas emissions: Annual miles ÷ MPG × 19.6 lbs CO₂/gallon (EPA combustion factor, doesn't include upstream extraction).
Manufacturing CO₂: EPA lifecycle estimates. EV battery manufacturing adds 4–8 tons vs gas vehicles; larger batteries = more manufacturing emissions. Source: Argonne National Laboratory GREET model.
Tree equivalency: 1 tree absorbs ~55 lbs (25 kg) CO₂/year. Source: US Forest Service.
Flight equivalency: Average US domestic round trip emits ~0.255 metric tons CO₂. Source: ICAO Carbon Emissions Calculator.
Frequently Asked Questions
Are EVs really better for the environment?
In most of the US, yes — significantly. Even accounting for manufacturing emissions (which are higher for EVs due to battery production), most EVs break even with gas cars within 1–3 years and save 30–70% of lifetime CO₂ emissions. The benefit is largest in states with clean grids like California, Washington, Oregon, and New York, and smallest in coal-heavy states like West Virginia and Wyoming. As the grid gets cleaner over time, EVs become even more beneficial.
How much CO₂ does manufacturing an EV produce?
Manufacturing an EV typically produces 8–15 metric tons of CO₂ more than a comparable gas car, primarily due to battery production. A Tesla Model 3 adds about 9 tons; a large SUV or pickup like the Rivian R1T adds 13–14 tons. However, this "carbon debt" is typically paid off within 1–3 years of driving, after which the EV is net-positive for the environment. Source: Argonne National Laboratory GREET model.
Which states have the cleanest electricity grids for EVs?
The cleanest grids for EV charging in the US are: Vermont (0.026 lbs CO₂/kWh — nearly all renewable/nuclear), Washington (0.132 — hydroelectric), Oregon (0.259 — hydro + wind), Idaho (0.157 — hydro), and California (0.397 — solar + wind). The dirtiest grids are West Virginia (1.01 — coal), Wyoming (1.035 — coal), and Hawaii (1.147 — oil). Data from EPA eGRID2023.
Does EV carbon footprint improve over time?
Yes, in two ways. First, the US electrical grid is getting cleaner every year as coal plants close and solar/wind expand — the average grid intensity dropped ~35% from 2007 to 2023. An EV bought today will produce less CO₂ per mile in 10 years than it does today. Second, if you add home solar, your EV's operational emissions drop to near-zero. No gas car has this potential for improvement.