Vehicle Fuel Cost Comparison Calculator

1. Enter the distance both vehicles will cover during a trip, week, month, or year.
2. Choose km/L or L/100 km and enter each vehicle's observed efficiency.
3. Enter the price per litre for each vehicle and label the currency.
4. Review litres used, fuel cost, cost per kilometre, the lower-cost vehicle, and the difference.

For a fair comparison, use the same distance and similarly representative mileage data. Different fuel prices are supported, but both price inputs must be per litre.

At these inputs, Vehicle B has the lower fuel running cost. This does not prove it is cheaper to own because the calculation excludes purchase, finance, servicing, repair, insurance, tax, tyre, and depreciation costs.

This tool answers a narrow question: how do two vehicles' fuel expenses compare over the same distance? It deliberately excludes acquisition and ownership assumptions that cannot be inferred reliably from fuel efficiency.

Add purchase price, loan interest, depreciation, registration, insurance, servicing, repairs, tyres, tolls, parking, and downtime separately when making a buying or fleet decision. An apparently efficient vehicle may not have the lowest total cost of ownership, while a higher purchase price cannot be justified by fuel saving alone without calculating the payback period from verified costs.

The estimate assumes both vehicles cover the entered distance, each efficiency value remains representative, and each price is entered per litre in the same currency. The period selector labels the scenario; it does not convert a daily distance into a monthly figure.

Results are estimates and do not predict future fuel prices or changes in traffic, routes, load, weather, vehicle condition, or driving behaviour. The tool does not convert currencies, gallons, miles, electricity, CNG mass, or diesel-specific energy values.

The comparison applies the visible arithmetic directly to your inputs and keeps unrounded intermediate values. It does not fetch fuel prices or vehicle specifications, so you remain in control of the data used.

Review the petrol expense formula guide and shared calculation methodology for more detail. Last reviewed: 3 August 2026.