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Cars and transport

Fuel consumption calculator

km/L and L/100 km, fuel cost and cost per kilometre from one fill-up.

Cars and Transport
km
L

Result

Fill in the fields and the result appears as you type.

B

Type the values into the fields and leave the rest to me.

How to use

Fuel consumption relates distance to the litres burned. Brazil and much of Europe read it as litres per 100 km, where lower is better; other countries read kilometres per litre, where higher is better. Both describe the same tank — the conversion is a division into 100.

  • Measure the real consumption of a car instead of trusting the dashboard.
  • Work out the fuel cost of a trip or of a month of commuting.
  • Compare two cars or two driving styles on the same route.
  1. Fill the tank, reset the trip meter and drive normally.
  2. Refuel to the top and write down the litres used and the kilometres driven.
  3. Enter both, and the price per litre if you want the cost.
  4. The result gives km/L, L/100 km, the total fuel cost and the cost per kilometre.

Formula

km/L = distance ÷ litres · L/100 km = (litres ÷ distance) × 100 · Cost = litres × price per litre

Example

400 km on 32 litres is 12.5 km/L, or 8 L/100 km. With fuel at 6.00 a litre, the trip costs 192.00 and each kilometre costs 0.48.

Limitations

  • The price per litre is typed by you: there is no live fuel price feed here, because a wrong feed would be worse than none.
  • Partial fill-ups distort the result — the reliable method is always filling to the top.

Frequently asked questions

Which number should I use to compare cars?

Either, as long as it is the same one. For efficiency, litres per 100 km reads in the same direction as cost: lower is better.

Is 10 km/L good?

For a petrol car in mixed city use, yes. Motorway figures are usually higher and urban, stop-and-go figures lower.

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