Road Trip Cost Calculator
Works out the fuel cost of a road trip including the return leg, adds tolls and parking, and splits the total between everyone travelling.
Share sends a link that reopens these numbers. Copy details pastes the full breakdown as a list.
The formula
total = (distance × trips ÷ economy) × price + tolls
The only wrinkle is the return leg — half of all road-trip miscalculations are someone costing the outbound journey and forgetting they have to come home.
What to watch out for
What this catches that a plain fuel calculation does not:
- The return leg. Obvious once stated, easy to forget when planning.
- The split. Four people sharing a 600-mile trip pay about the same each as a single train ticket — that comparison is the whole reason people run this calculation.
- Tank fills. Knowing you need three stops changes the plan, not just the budget.
Motorway driving tends to beat the official figure on a long steady run, so a trip like this is one of the few cases where the sticker economy is roughly honest.
Frequently Asked Questions
How much will a 500 mile road trip cost?
At 35 mpg (US) and $3.50 a gallon, about $50 each way, so $100 return. Split between four people that is $25 each.
Is driving cheaper than the train?
For one person, rarely. For three or four sharing, usually — the fuel cost does not change with passengers while ticket prices multiply. The cost-each figure is what makes the comparison.
Should I include tolls?
Yes. On some routes tolls exceed the fuel. The field is optional and added before the split.
How many times will I need to fill up?
The calculator assumes a 50-litre (13 US gallon) usable tank, which is typical for a mid-size car. Larger SUVs run 60–80 litres, small hatchbacks 40–45.