Truck & SUV Petrol Calculator

1. Enter the one-way distance and select kilometres or miles.
2. Enter mileage measured for your truck or SUV and choose km/L, L/100 km, US MPG, or Imperial MPG.
3. Enter the local petrol price with the matching litre or gallon unit and currency.
4. Select one way or return, then review total distance, fuel required, total petrol cost, and cost per distance unit.

For a loaded pickup or towing trip, use fuel efficiency recorded under similar conditions. Vehicle type does not justify a universal load adjustment, so the calculator uses the value you provide.

The 8 km/L input is an example, not a claim for a particular truck. Replace it with a refill-based average for your engine, drivetrain, load, route, and driving conditions.

Payload, towing weight, trailer shape, roof racks, four-wheel-drive use, engine size, transmission, tyre choice, tyre pressure, speed, acceleration, idling, traffic, hills, wind, and temperature can all alter consumption. Maintenance, wheel alignment, air filters, fuel quality, and route length also matter.

Loaded vs Unloaded Travel

Extra mass usually requires more energy during acceleration and climbing, while a trailer can add substantial aerodynamic drag. The effect is not a reliable fixed percentage. Record separate loaded, towing, city, and highway averages when those journeys differ materially.

One-Way vs Return Journeys

Select return only when the entered distance covers one direction. Outbound and return efficiency may differ because of cargo delivery, elevation, wind, or traffic; for greater accuracy, calculate each leg separately with its relevant mileage.

km/L, L/100 km, and MPG

Convert km/L and L/100 km with L/100 km = 100 ÷ km/L. One mile equals 1.609344 kilometres. One US gallon equals 3.785411784 litres and one Imperial gallon equals 4.54609 litres, so always identify which MPG system your record uses.

• Track odometer distance and litres added across several comparable refills.
• Maintain specified tyre pressure, alignment, filters, oil, and service intervals.
• Remove unnecessary cargo or exterior accessories when they are not needed.
• Use smooth acceleration, an appropriate safe speed, and reduce avoidable idling.
• Plan routes and consolidate journeys where practical.

Results vary by vehicle and conditions. These actions may improve efficiency, but no fixed saving is guaranteed.

The calculator uses exact conversion constants: 1 mile = 1.609344 kilometres, 1 US gallon = 3.785411784 litres, and 1 Imperial gallon = 4.54609 litres. It preserves unrounded intermediate values and rounds only displayed fuel and currency results.

Read the shared calculation methodology for formulas, assumptions, and testing details. Last reviewed: 3 August 2026.