OmniCalcsFuel Cost Trip Calculator
Plan a road trip budget: fuel cost, split between passengers and estimated CO2.
How to Use This Calculator
Enter distance, your car's fuel consumption, current fuel price and number of passengers. Results update with realistic estimates.
- Use real-world consumption, not the sticker figure, for accuracy.
- CO2 varies with fuel type, driving style and load.
Frequently Asked Questions
How do I find my car's L/100km?
Divide liters filled at the pump by kilometers driven since the last fill, then multiply by 100.
Is the CO2 estimate accurate?
It's a good average using ~2.31 kg CO2 per liter of petrol. Diesels emit a bit more per liter; EVs emit none directly.
What if fuel economy is in mpg?
Convert it first with the Fuel Economy Converter — 282.5 ÷ mpg(US) gives L/100km.
Does it include tolls or parking?
No — this covers fuel only. Add tolls and other costs separately to your budget.
Practical Example
A 300 km trip at 7.5 L/100km with fuel at $1.50 per liter uses (300 / 100) x 7.5 = 22.5 liters, costing 22.5 x $1.50 = $33.75. Split three ways that is $11.25 per person, and the trip produces about 22.5 x 2.31 ≈ 52 kg of CO2.
- Use your real-world consumption rather than the sticker figure for a more accurate budget.
What Your Results Mean
- Fuel needed — liters you will buy for the trip, from distance and consumption.
- Total cost — liters multiplied by the current fuel price.
- Cost per person — the fair share for carpooling when you split the bill evenly.
- Estimated CO2 — roughly 2.31 kg of CO2 per liter of petrol burned.