Fuel Cost Calculator
The fuel and cost of a trip from distance, fuel economy and price, in km or miles, L/100 km or mpg, split between passengers.
Your trip
Filled in with example values. Replace them with your own.
Optional
Share the fuel cost between people in the car.
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Results update as you type.
Result
Fuel for 500 km: 35 L, costing $64.75
Fuel cost
$64.75
- Fuel needed
- 35 L · 9.25 US gal · 7.7 UK gal
- Cost per km
- $0.13
- Your economy in other units
- 14.29 km/L · 33.6 mpg (US) · 40.35 mpg (UK)
How it’s calculated
Fuel needed
500 km × 7 L/100 km = 35 L
Cost
35 L × $1.85 per litre = $64.75
1 mile = 1.609344 km; 1 US gallon = 3.785411784 L; 1 UK gallon = 4.54609 L.
How the fuel cost calculator works
Enter the distance, your car’s fuel economy and the fuel price, in whichever units you use. The calculator works out how much fuel the trip needs and what it costs, for one way or a round trip, and can split the cost between passengers.
The formula
Fuel = Distance × Consumption
Cost = Fuel × Price
L/100 km = 235.215 ÷ US mpg = 282.481 ÷ UK mpg
Exact units: 1 mile = 1.609344 km; 1 US gallon = 3.785411784 L; 1 UK gallon = 4.54609 L.
Worked examples
- 500 km at 7 L/100 km uses 35 L; at 1.85 a litre, that is 64.75.
- 300 miles at 30 US mpg uses 10 US gallons; at 3.49 a gallon, 34.90.
- A 250 km round trip at 6 L/100 km and 2.00 a litre costs 60.00, or 20.00 each for three people.
Frequently asked questions
Where do I find my car’s fuel economy?
Many cars show it on the dashboard. You can also work it out: fill the tank, note the trip distance at the next fill-up and divide by the fuel you put in. Official figures can differ from your own driving, so your own measurement fits your trips best.
What is the difference between US and UK mpg?
A US gallon is 3.785 litres and a UK (imperial) gallon is 4.546 litres. The same car does more miles per UK gallon than per US gallon: 7 L/100 km is about 33.6 US mpg but 40.4 UK mpg.
Why is the real cost different?
Fuel use changes with speed, traffic, hills, load, air conditioning and the weather, and prices differ between stations. The result is an estimate from the figures you enter.
Does it include tolls or parking?
No, only fuel. Add tolls, parking and other costs with the Travel Budget Calculator.