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Fuel Cost Calculator

Estimate how much fuel a journey will use and what it will cost, from distance, efficiency and fuel price.

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Quick answer

Fuel Cost is a free, private online tool that lets you estimate the fuel cost of a trip from distance, efficiency and fuel price. It runs entirely in your browser, so nothing you enter is uploaded to a server.

How to use the Fuel Cost

  1. Fill in each input field with your own numbers.
  2. Results calculate automatically and update as you change any value.
  3. Read the result cards below the inputs for the full breakdown.
  4. Adjust any field to explore different scenarios instantly.

Privacy: this tool runs entirely in your browser. Your input is never sent to, received by, or stored on any server — there are no uploads and no tracking of what you enter.

About Fuel Cost

What it calculates

Enter the trip distance, your vehicle's efficiency (L/100km) and the fuel price to get the fuel needed and total cost.

Plan and split

See cost per km too, useful for budgeting or splitting travel costs between passengers.

Where it helps

Road trips, commuting costs, and comparing vehicles or routes.

Frequently asked questions

What units does it use?
Distance in km, efficiency in L/100km, and price per liter.
Can I work out cost per km?
Yes — it is shown alongside the total.
Does it include tolls?
No — it estimates fuel only.

Understanding Fuel Cost in depth

What this calculator estimates

A fuel cost calculator estimates how much fuel a journey will use and what it will cost, from three inputs: the distance, your vehicle's fuel efficiency, and the price of fuel. It is the quick way to budget a road trip or compare the running cost of different routes or vehicles.

How the maths works

The fuel needed is distance x consumption. With efficiency in litres per 100 km, fuel used = distance / 100 x consumption, and the cost is that volume x price per litre. So a 500 km trip in a car using 7 L/100 km needs 35 litres; at 1.60 per litre that is 56. The tool also shows the cost per kilometre.

Understanding fuel efficiency

Efficiency here is expressed as litres per 100 km (lower is better) - the standard in most of the world. If your car's economy is quoted in miles per gallon, convert it first (the Fuel Economy converter does this). Real consumption is usually higher than the official figure, especially in city driving, cold weather or with a loaded vehicle, so pad your estimate a little.

Splitting and comparing costs

Because it shows cost per kilometre, the calculator makes it easy to split travel costs between passengers or to compare vehicles and routes. It is handy for deciding whether a longer but smoother motorway route actually costs more than a shorter stop-start one, and for setting fair mileage reimbursement.

Everyday uses

Budget a road trip, compare the running cost of two cars, work out fair fuel-money for car-sharing, and estimate commuting costs. It covers fuel only - tolls, parking and wear are extra. Everything is calculated in your browser.

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