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Tools / Fuel cost calculator

Fuel cost calculator

Works out the fuel a trip needs and what it costs, split between passengers if you are sharing. It accepts all three efficiency conventions — kilometres per litre, litres per 100 km and miles per gallon — because they are not interchangeable: two go up as the car gets better and one goes down.

Runs entirely in your browser

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About this tool

Estimate what a journey will cost in fuel. Enter the distance, your vehicle’s efficiency and the fuel price, and the tool works out how much fuel the trip needs and what it costs — and can split that cost between passengers if you are sharing a ride.

It accepts all three common ways of expressing efficiency — kilometres per litre, litres per 100 km, and miles per gallon — because they are not interchangeable and mixing them up produces wildly wrong answers. Two of them (km/l and mpg) go up as the car gets more efficient, while litres per 100 km goes down, so the tool asks which convention you are using and handles the maths accordingly.

It runs in your browser, so your trip details stay private. Use it to budget a road trip, work out a fair share for a carpool, or compare the running cost of different vehicles or routes.

Frequently asked questions

What information do I need to estimate fuel cost?
The trip distance, your vehicle’s fuel efficiency, and the price of fuel. From those the tool calculates the fuel required and the total cost.
Which efficiency units does it support?
Kilometres per litre, litres per 100 km, and miles per gallon. These are not interchangeable, so the tool lets you pick the one you use to avoid errors.
Why does a lower litres-per-100-km number mean a better car?
Because it measures fuel used per fixed distance, so less is better — the opposite of km/l and mpg, where a higher number means more efficient. The tool accounts for this difference.
Can it split the cost between passengers?
Yes. Enter the number of people sharing and it divides the fuel cost into an equal share each, which is handy for carpools.
Are my trip details kept private?
Yes. The calculation runs in your browser, so nothing you enter is sent to a server.

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