Fuel Cost Calculator
Estimate trip fuel use and cost.
Use the Fuel Cost Calculator tool
What this fuel cost calculator does
Fuel Cost Calculator converts your consumption figure to litres per 100 km, applies it to the trip distance and multiplies by the price you enter. US and UK MPG are both supported, since the two gallons differ. The result includes litres needed, total cost and cost per 100 km.
The estimate assumes steady consumption. Traffic, speed, load, air conditioning, terrain and tyre pressure all change real fuel use, and official consumption figures are usually optimistic. Prices vary by station and change often, so enter the price you actually expect to pay.
Why use it
- Budget for a road trip before you leave.
- Compare the fuel cost of two routes.
- Convert an MPG figure into litres for a price calculation.
How to use it
- 1Enter the distance in kilometres.
- 2Enter your consumption and choose its unit.
- 3Enter the fuel price per litre.
- 4Read fuel needed and total cost.
Worked examples
Metric consumption
Input
420 km at 6.8 l/100km
Output
Litres required and the cost at your entered price.
US MPG
Input
30 mpg US
Output
The MPG figure is converted to litres per 100 km before the cost is calculated.
Common mistakes
- Mixing US and UK gallons.
- Using the price per gallon when the tool expects a price per litre.
- Expecting the estimate to match city traffic exactly.
Frequently asked questions
Why does the price need to be per litre?
Consumption is converted to litres, so the price must use the same unit. Divide a gallon price by 3.785 for US gallons or 4.546 for UK gallons.
Does it include return trips?
Enter the total distance, including the return leg, if you want a round-trip estimate.
How accurate is it?
It is arithmetic based on your inputs. Real consumption varies with driving conditions.
Does it use live fuel prices?
No. You enter the price, and nothing is fetched or stored.