Fuel Cost Calculator
Calculate fuel cost for any trip based on distance, fuel price, and vehicle mileage. Supports metric and imperial units, round trip, CO2 estimate, and side-by-side vehicle comparison. Free, no sign-up.
How to Use
Enter trip distance
Type the one-way distance in kilometres (metric) or miles (imperial). Toggle the round trip switch to double it automatically.
Set fuel price
Enter the current fuel price per litre or per gallon depending on your selected unit system.
Enter vehicle mileage
Provide your vehicle's fuel efficiency in km/L or MPG. Use your car's official figure or a real-world average.
Compare a second vehicle (optional)
Enable the comparison mode to add a second vehicle and see fuel cost and CO2 side-by-side.
View results
See total fuel needed, total cost, and estimated CO2 emissions for the trip instantly.
Features
Metric & Imperial
Switch between km/L and MPG, litres and gallons with a single toggle. All values convert automatically.
Round Trip Toggle
One click doubles the distance for return journeys without re-entering numbers.
CO2 Emission Estimate
Estimates grams of CO2 emitted per km using standard petrol combustion factors so you understand your environmental footprint.
Compare Two Vehicles
Enter a second vehicle's mileage and compare fuel cost and CO2 side-by-side to decide which car is more economical.
Frequently Asked Questions
Recommended Reading
Practical guides matched to this calculator, its inputs, and the result users need to trust.