Free EV emissions calculator. Compare your electric car's grid-based CO₂ to a gas car per mile and over its lifetime, and find the break-even point.
Your local grid's carbon intensity is the single biggest factor in an EV's emissions — pick your region or enter a custom value.
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Is an electric car actually cleaner? Unlike a gasoline car — whose CO₂ comes straight from its tailpipe — an EV's emissions depend on the electricity you charge with, so the answer changes with your grid. This calculator estimates your EV's grid-based CO₂ per mile, per year, and over its lifetime, compares it to an equivalent gas car, accounts for battery-manufacturing emissions, and shows the break-even point where the EV pulls ahead.
An EV has no tailpipe CO₂, but it is not emission-free. Its footprint has two parts: manufacturing — mainly the battery, roughly 75 kg CO₂ per kWh of capacity — and charging, which depends entirely on your grid. On the US-average grid (0.394 kg CO₂/kWh, EPA eGRID2022) an EV emits far less per mile than a gas car; on a coal-heavy grid a large EV can be close to break-even, while on renewable, nuclear, or hydro power it is dramatically cleaner. Because the battery adds up-front CO₂, an EV starts life 'behind' a gas car and then repays that deficit through lower driving emissions — the break-even point, typically a couple of years on an average grid.
EV Emissions Formula
People weighing an EV who want the real, grid-specific environmental case — not a slogan.
Drivers optimizing when and where they charge for the lowest possible emissions.
Communicators who need accurate, source-backed EV-vs-gas numbers for their region.
Professionals modeling transport emissions under different grid and mileage scenarios.
Your driving and local grid decide the environmental case for an EV — model it before you buy.
Electricity source matters enormously — the chart shows your EV's CO₂ from renewable all the way to coal.
See how many miles it takes for lower charging emissions to repay the battery's manufacturing footprint.
As grids add renewables, your EV's emissions fall automatically — a gas car's never do.
On most grids, yes. On the US-average grid an EV emits far less CO₂ per mile than a comparable gas car, and even more so on renewable, nuclear, or hydro power. Only on a very coal-heavy grid does a large, inefficient EV approach parity with an efficient gas car — which is exactly why this tool lets you pick your grid.
An EV's driving emissions are its energy use times the grid's carbon intensity. That intensity ranges from about 0.02–0.04 kg CO₂/kWh (renewable) through 0.394 (US average, EPA eGRID2022) up to ~0.95 (coal). A gas car, by contrast, emits roughly the same per mile no matter where you fuel it, so your grid choice is the biggest lever on the comparison.
Battery manufacturing adds roughly 75 kg CO₂ per kWh of capacity (published estimates span ~49–118 kg/kWh). A 75 kWh battery is therefore about 5.6 tonnes, which is why an EV's manufacturing footprint starts higher than a gas car's — a deficit repaid over the first years of driving.
It is the distance an EV must drive for its lower charging emissions to offset its higher up-front (battery) emissions versus a gas car. On the US-average grid that is typically around 25,000–48,000 miles (about 2–4 years); on a clean grid it happens far sooner, and on coal it takes much longer. Treat it as an estimate.
Yes. Choose the EU-average or Spain grid, or enter your country's carbon intensity as a custom kg/kWh value, and switch the distance to kilometers. Spain (~0.17 kg/kWh) and the EU average (~0.24) come from Ember / Our World in Data.
Use the Vehicle Emissions Calculator. It computes tailpipe CO₂ directly from your MPG and needs no grid data. This EV calculator is specifically for electric vehicles and the electric-vs-combustion comparison.