Road transport
Car emissions calculator: fuel use and yearly impact
This transport-focused page complements the car carbon guide by emphasizing fuel pathways, annualization tricks, and fleet-style comparisons for commuters.
Drivers experience emissions as fuel purchases and tailpipes, but sustainability teams also care about upstream fuel extraction and refining differences between regions.
Electric vehicles move combustion to power plants, which can be cleaner or dirtier than local petrol depending on hour and grid.
Because vehicle efficiency varies by maintenance and driving style, treat modeled outputs as planning numbers verified with odometer logs.
Combining car results with public transport fields captures multimodal commuters fairly.
How are car CO2 emissions calculated per year?
Emissions scale with kilometers times kg per kilometer for each fuel in the configuration file.
Yearly totals assume the entered period is representative; seasonal tires and winter warm-up change real-world curves.
Fuel consumption storytelling
Liters per hundred kilometers can be converted to CO2e using national fuel factors outside this tool; here we stay with distance-based simplicity for beginners.
Electric versus combustion comparison
Use the EV comparison card in results after entering both scenarios sequentially, or run two saved reports if you need side-by-side archives.
Worked examples (modeled CO₂e)
Figures use factors from the calculator configuration unless a scenario specifies a custom grid intensity.
| Scenario | Monthly (kg) | Yearly (kg) | Detail |
|---|---|---|---|
| Urban petrol | 99.8 | 1,198.1 | 120 km/week, petrol car factor 0.192 kg/km. |
| Highway diesel | 444.3 | 5,335.2 | 600 km/week, diesel car factor 0.171 kg/km. |
| EV commuter | 50.0 | 600.6 | 210 km/week, electric car factor 0.055 kg/km. |
Comparison table
Illustrative fuel pathways at 15,000 km/year
| Fuel | Approx. yearly CO2e (kg) | Notes |
|---|---|---|
| Petrol | ≈ 2,880 | 0.192 kg/km × 15,000 km |
| Diesel | ≈ 2,565 | 0.171 kg/km × 15,000 km |
| Electric | ≈ 825 | 0.055 kg/km × 15,000 km |
Sustainability recommendations
- Carpool high-mileage days first.
- Bundle errands into rhombus routes near home.
- Consider e-bikes for sub-eight-kilometer trips.
Energy efficiency tips
- Keep tires inflated to seasonal specs.
- Remove unused roof boxes.
- Avoid aggressive acceleration unless safety demands it.
Ways to reduce emissions
- Try transit one day weekly.
- Model telework Wednesdays.
- Downsize spare vehicles after honest utilization logs.
Dial diesel versus petrol in one click
Switch fuel type after cloning your baseline distance to see instantaneous factor differences.
Open the calculatorRelated calculators and guides
- Motorcycle carbon
- EV carbon savings
- Public transport
- Air travel footprint
- How is CO2 emission calculated?
- Scope 1, 2, and 3 emissions
- Electricity and carbon footprint
- Air travel impact
Frequently asked questions
Answers mirror the FAQ structured data on this page for consistency with search guidelines.
Does diesel beat petrol here?
Per kilometer the configured diesel factor is lower, but real-world NOx and particulate concerns are environmental beyond CO2e. Policy contexts vary; do not oversimplify to tailpipe CO2 alone when advising cities.
Why might my odometer disagree?
Towing, roof loads, winter fuel blends, and traffic patterns alter liters per kilometer. The calculator cannot see those without richer inputs.
How do plug-in hybrids fit?
Treat blended weeks by estimating electric kilometers versus fuel kilometers separately, then sum the two modeled results conceptually. Native PHEV modeling may arrive in a future release.
Are motorcycles included?
Use the dedicated motorcycle page for handlebar vehicles; car factors assume four-wheel aerodynamics.
What about rideshare?
Allocate shared trips by seat-kilometers if reporting professionally; this UI models one vehicle at a time.
Can fleets export CSV?
Use copy summary in the tool for a text snapshot today; integrate APIs for fleet dashboards as a custom deployment exercise.