Road Trip Cost Calculator
Estimate fuel, tolls and stops for a road trip and split the cost among travellers.
About the Road Trip Cost Calculator
Enter the one-way distance, whether you're coming back, your fuel economy, the fuel price, tolls, other costs and the number of travellers. The calculator gives the fuel needed, the trip cost and the cost per traveller.
Highway driving at steady speeds is usually more efficient than the combined rating; roof boxes, heavy loads and speeds above about 100 km/h (60 mph) cut economy noticeably.
The formula
Fuel = distance ÷ mpg (or distance × L/100 km ÷ 100)
Worked example
600 km each way at 7 L/100 km, fuel 1.90 a litre, 3 travellers
- Distance: 1,200 km
- Fuel: 1,200 × 7 ÷ 100 = 84 L, costing 160
- About 53 each
Questions people ask
Should I count wear and tear?
For a full cost, add about the IRS business rate minus fuel, or your own per-mile maintenance estimate.
How do I split with uneven riders?
Split fuel by distance each person rode.
How much does a roof box cost in fuel?
Often 10–20% more at motorway speeds; take it off when you don't need it.