Running costs · free calculator
Fuel cost calculator
Pick your car from our catalog or type its consumption, set the distance and what you pay for fuel. You get the trip cost, the share per person, cost per km and CO₂ — and the same trip in rival cars.
Result
Trip fuel cost€56.88500 km · 6.5 l/100 km
- Fuel used
- 32.5 l8.6 US gal · 7.1 UK gal
- Distance
- 500 km311 mi
- Consumption
- 6.5 l/100 km43.5 mpg UK · 36.2 mpg US
- Fuel price
- €1.75 per litre€6.62 per US gallon
- Cost per 100 km
- €11.38
- Cost per km
- €0.114
- CO₂ from the exhaust
- 75 kgabout 2.31 kg per litre of petrol
The same trip in cars from our catalog
- Your figures€56.88 · 6.5 l/100 km
- Ford Fiesta · 1.0 EcoBoost€37.63 · 4.3 l/100 km
- Toyota Corolla XI · 103 kW (140 PS) Sedan€49.00 · 5.6 l/100 km
- BMW 3 Series G20 · 330i€59.50 · 6.8 l/100 km
- Chevrolet Corvette C8 · E-Ray 6.2 V8 hybrid (EU)€110 · 12.6 l/100 km
Official combined consumption of each version (EPA combined where no European figure is known); your distance and fuel price.
Example with typical values — change the fields to calculate your own.
How the fuel cost is calculated
The calculator converts your consumption to litres per 100 km first (mpg and km/l figures are converted with exact factors: 235.21 ÷ mpg US, 282.48 ÷ mpg UK, 100 ÷ km/l). Litres used = distance in km × l/100 km ÷ 100, doubled for a return trip. The trip cost is litres used × the price of one litre; a price per gallon is converted first (1 US gallon = 3.785 l, 1 UK gallon = 4.546 l). For an electric car the same sum runs in kWh: kWh used = distance × kWh/100 km ÷ 100, times the price of a kWh.
Real-world consumption depends on speed, load, temperature, tyre pressure and traffic, so official WLTP or NEDC figures are usually lower than what you will see on the road. For a realistic estimate, use the consumption shown by your trip computer over several fill-ups.
Currency, cost per person and CO₂
Type the fuel price in your own currency — euro, US dollar, pound, Swiss franc, złoty, hryvnia and more. The price you enter is used as it is; nothing is converted. Sharing the car? The cost per person is the trip cost divided by the number of people. Tailpipe CO₂ is estimated from the fuel burnt: about 2.31 kg per litre of petrol, 2.68 kg per litre of diesel and 1.51 kg per litre of LPG; an electric car emits none at the tailpipe.
Cost per kilometre
Cost per 100 km = l/100 km × fuel price. Divide it by 100 to get the cost per kilometre — handy for comparing a car with public transport or for splitting the cost of a shared trip.
Frequently asked questions
How do I calculate the fuel cost of a trip?
Multiply the distance in km by the consumption in l/100 km, divide by 100 to get litres, then multiply by the price of a litre of fuel.
How do I convert mpg to l/100 km?
Divide 282.48 by the UK mpg figure, or 235.21 by the US mpg figure. For example, 40 mpg UK is about 7.1 l/100 km.
Can I use dollars, pounds or another currency?
Yes. Choose the currency next to the price and enter what you pay per litre, per gallon or per kWh — the result is shown in the same currency.
Why is my real fuel cost higher than the official figure?
Official figures come from a standard laboratory cycle. Higher speeds, short trips, cold weather, roof boxes and under-inflated tyres all increase real consumption.