Fuel Cost Calculator
Free fuel cost calculator: the fuel and cost of any trip from distance, economy and price — mix km/miles, L/100km or MPG, and per-litre or per-gallon freely.
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- ✓ Runs in your browser — nothing uploaded
- ✓ No sign-up
- ✓ Free, no limits
Based on steady real-world economy — motorway cruising beats stop-start city driving, and a loaded car, cold weather or aggressive acceleration all push consumption up. Mix your units freely; everything is converted for you.
This fuel cost calculator tells you what a journey will cost to drive, and how much fuel it will burn, from three numbers: the distance, your car's fuel economy, and the price of fuel. It also shows the round trip, because the question is usually 'can I afford to drive there and back'.
What sets it apart is that you don't have to convert anything first. Distance can be kilometres or miles; economy can be litres per 100 km, kilometres per litre, US MPG or UK MPG (which differ, because the gallons differ); and price can be per litre or per US/UK gallon. Mix them however your dashboard and your local pump are labelled — a US car rated in MPG driven on a trip you measured in miles with fuel priced per gallon, or a European car in L/100km. Worked example: 500 km at 7.5 L/100km with fuel at $1.60 a litre is 37.5 litres and about $60 one way.
The estimate is only as good as the economy figure you feed it — real consumption climbs with city stop-start driving, a loaded car, cold weather and a heavy right foot, so treat the manufacturer's number as optimistic. Everything is computed in your browser; nothing is uploaded.
Frequently asked questions
How do I calculate the fuel cost of a trip?
Work out the fuel used — distance divided by economy — then multiply by the price per unit. This calculator normalises whatever units you enter (km or miles, L/100km or MPG, per litre or per gallon) and does it for you, one-way and round-trip.
Can I mix metric and imperial units?
Yes — that's the point. Enter distance in miles, economy in L/100km and price per gallon if that's what you have; each field has its own unit selector and everything is converted internally before the cost is worked out.
Why is US MPG different from UK MPG?
Because the gallons differ: a UK gallon (4.546 L) is about 20% larger than a US gallon (3.785 L), so the same car shows a higher MPG number in UK units. The calculator has separate options for each so you don't have to remember the factor.