Fuel Cost Calculator
Enter the trip distance, your car’s consumption and the fuel price to see the liters needed, the total cost and each person’s share when splitting.
The formulas
Liters = distance ÷ 100 × consumption
Total cost = liters × price per liter
Per person = total cost ÷ people
Worked example: a 300 km trip at 7 L/100km needs 300 ÷ 100 × 7 = 21 liters; at 1.5 per liter the cost is 31.5, which is 10.5 each when 3 people share.
How to use
- Enter the trip distance in kilometres.
- Enter your car’s average consumption in L/100km and the current fuel price per liter.
- Click Calculate to see the liters needed, the total cost and each person’s share when split.
Frequently asked questions
How do I find my car’s real consumption?
Fill the tank, note the odometer, drive normally, then fill again and divide the liters added by the kilometres driven and multiply by 100. A car’s trip computer is a decent shortcut but often optimistic. City driving, short trips, heavy loads and roof racks raise consumption well above the official figure, so a measured average is the best input for this tool.
Should I enter a one-way or round-trip distance?
Enter the total distance you expect to drive. For a return journey, double the one-way distance before entering it, or simply calculate the one-way cost and double the result — both give the same answer. If the trip includes detours, traffic loops or a long drive to the petrol station, adding a small margin to the distance keeps the estimate honest.
Why does my real cost sometimes come out higher?
The formula assumes a constant consumption and a fixed price per liter. In reality, motorway cruising, mountain passes, air-conditioning and cold starts change consumption, and prices differ between stations and regions. Tolls, parking and vehicle wear are not included at all. Treat the result as a central estimate for planning, and add a margin of 10 to 15 percent for real-world conditions.
How does splitting the cost work?
Enter the number of people sharing, and the calculator divides the total fuel cost evenly and shows each person’s share. This is the fairest simple arrangement when everyone travels the whole route. It covers fuel only: tolls, parking and food are separate. For partial routes or different vehicles, run the calculation for each leg and add the shares.
Are the results exact?
They are estimates by nature. The arithmetic is exact for the figures you enter, but consumption varies with traffic, terrain and driving style, and fuel prices move daily. The tool also ignores tolls and parking, which can rival fuel on some routes. Use the output for budgeting and for fair splitting between friends, and remember it is an estimate, not a guaranteed expense or financial advice.