How the fuel cost is calculated
The calculator first works out how much fuel the trip needs, then multiplies it by the price you pay at the pump.
Fuel cost = fuel needed × price per liter
If your car shows km/L or mpg instead of L/100 km, choose that unit — the calculator converts it for you. Prices can be entered per liter or per US or UK gallon. The currency is whatever you type in, so it works in euros, lira, pounds, or dollars.
Worked example
A 450 km trip in a car that averages 6.5 L/100 km, with fuel at 1.80 per liter:
Shared between three people, everyone pays 17.55. As a round trip the total doubles to 105.30.
Get a more accurate estimate
The biggest source of error is the consumption figure. Manufacturer ratings are measured in lab conditions and are often 10–20% lower than real driving. Measure your own consumption with the fuel consumption calculator, or log your fill-ups in the Fuellow app to see your real average and what you actually spend on fuel each month.
Frequently asked questions
How do I calculate the fuel cost of a trip?
Multiply the trip distance by your fuel consumption to get the fuel needed, then multiply by the fuel price. For example, 450 km at 6.5 L/100 km needs 29.25 L; at 1.80 per liter that costs 52.65.
Which fuel consumption figure should I use?
Use your real-world average if you have one — it is usually higher than the manufacturer figure. Highway trips at steady speed often use less fuel than your mixed average, while heavy loads, roof boxes, and high speeds use more.
Can I split the fuel cost with passengers?
Yes. Enter the number of people sharing the cost and the calculator shows the amount per person. Tick round trip if the same route is driven back.
Does this include tolls or parking?
No. The calculator covers fuel only. Add tolls, parking, and other trip costs separately.
