Calculate your vehicle's CO₂ emissions per mile from fuel type and MPG. Compare against average and see annual carbon footprint.
Every gallon of gasoline burned produces about 19.6 pounds (8.89 kg) of CO₂. Diesel produces about 22.4 pounds (10.16 kg) per gallon. Your vehicle's actual CO₂ emissions per mile depend directly on your fuel economy: better MPG means fewer emissions per mile.
The average US passenger vehicle emits about 404 grams of CO₂ per mile. Fuel-efficient vehicles can cut this to 200–300 g/mile, while trucks and SUVs may emit 500–700 g/mile. Electric vehicles produce zero tailpipe emissions but have upstream power generation emissions.
This calculator converts your MPG and fuel type into CO₂ per mile, annual emissions, and comparisons to the US average. Understanding your carbon footprint is the first step toward reducing it.
Whether you drive a compact sedan, a full-size SUV, or a pickup truck, accurate carbon emissions per mile figures help you plan smarter and avoid costly surprises at the pump or dealership. Use this tool regularly to track changes over time and adjust your transportation budget accordingly.
As climate awareness grows, many drivers want to understand their vehicle's environmental impact. This calculator translates MPG into CO₂ emissions, making it easy to compare vehicles, understand your carbon footprint, and evaluate improvements. Results update instantly as you adjust inputs, making it easy to explore different scenarios and find the best option for your driving needs and budget.
CO₂ per mile (lbs) = CO₂ per gallon ÷ MPG Gasoline: 19.6 lbs CO₂/gallon Diesel: 22.4 lbs CO₂/gallon E85: 14.0 lbs CO₂/gallon (net, accounting for biogenic carbon)
Result: 0.70 lbs CO₂/mile, 10,500 lbs/year
19.6 lbs/gal ÷ 28 MPG = 0.70 lbs CO₂/mile. At 15,000 miles/year: 10,500 lbs (4.76 metric tons) CO₂. US average is 12,120 lbs — you're 13% below average.
Compact car (35 MPG): ~0.56 lbs/mile. Midsize sedan (28 MPG): ~0.70 lbs/mile. SUV (22 MPG): ~0.89 lbs/mile. Pickup truck (18 MPG): ~1.09 lbs/mile. Hybrid (50 MPG): ~0.39 lbs/mile. EV (US avg grid): ~0.35 lbs/mile equivalent.
The calculator shows tailpipe emissions only. Add 20–30% for "well-to-wheel" emissions that include crude oil extraction, refining, and transportation. A full lifecycle analysis also includes vehicle manufacturing, which adds about 15–20 metric tons spread over the vehicle's lifetime.
Switching from a 20 MPG truck to a 35 MPG sedan saves 6,700 lbs CO₂/year. Adding a 50 MPG hybrid as your commuter saves 4,700 lbs. Going fully electric (on US average grid) saves 5,300 lbs vs. a 28 MPG gasoline car.
Transportation accounts for 29% of US greenhouse gas emissions, making it the largest sector. Personal vehicles contribute about 60% of that. Improving fleet average MPG, electrifying vehicles, and reducing vehicle miles traveled are all critical strategies for meeting climate goals.
The average US passenger vehicle produces about 12,100 lbs (5.5 metric tons) of CO₂ per year, based on average MPG of 24.2 and average annual mileage of 14,263 miles. This is direct tailpipe emissions only, not including fuel production emissions.
Per gallon, yes (22.4 vs 19.6 lbs). But per mile, diesel often produces less CO₂ because diesel engines are 25–35% more efficient. A diesel at 35 MPG emits 0.64 lbs/mile vs. gasoline at 28 MPG at 0.70 lbs/mile.
EVs have zero tailpipe emissions but generate upstream emissions from electricity generation. On the US average grid, an EV produces about 0.30–0.40 lbs CO₂/mile equivalent — about half of an efficient gasoline car. On clean grids (hydro, solar), it's near zero.
You can purchase verified carbon offsets for $10–25 per metric ton. The average car (5.5 tons/year) would cost $55–$138/year to offset. Look for Gold Standard or Verra-certified offsets for reliable emissions reduction.
E85 tailpipe emissions are about 14 lbs CO₂/gallon (net), lower than gasoline's 19.6. However, due to lower MPG, the per-mile difference is smaller. On a lifecycle basis (including corn farming), E85 reduces greenhouse gases by about 15–25% vs. gasoline.
For the average American, driving represents about 25–30% of their total carbon footprint. The rest comes from home energy (20%), food (15%), goods/services (25%), and air travel (10%). Reducing driving emissions has the single largest impact.