Fuel consumption and trip cost calculator
Litres per 100 km and cost of a trip
Motorway tolls, parking and tyre wear aren't included. Use the price on the pump, as it changes every week. Results are shown in dinars.
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For the cost of a trip, enter distance, your car's consumption per 100 km and the price of a litre. A 240 km drive at 6.5 litres per 100 km uses 15.6 litres, so at 190 dinars a litre the fuel costs 2,964 dinars. For consumption, divide the litres you filled by the kilometres driven and multiply by 100.
How it works
Fuel for a trip = km × consumption / 100, then multiplied by the price per litre. Consumption = litres filled / km driven × 100.
The most reliable method is full tank to full tank. Fill until the nozzle clicks off, reset the trip meter, and at the next fill-up divide the litres by the kilometres. The car's own trip computer often reads a little low.
On a motorway, speed matters most. A car uses noticeably more at 130 km/h than at 100 km/h, because air resistance grows with the square of speed. For a long drive, enter your motorway figure rather than the town one.
Worked example
Belgrade to Niš and back: about 240 km each way, a car using 6.5 l per 100 km, diesel at 190 dinars. The round trip needs 31.2 litres, or 5,928 dinars. Split four ways, each person pays 1,482 dinars for fuel; the motorway toll is shared separately.
Consumption: you filled the tank to the brim, drove 600 km and then put in 42 litres to fill it again. The car uses 7 l per 100 km, and at 190 dinars a litre each kilometre costs 13.30 dinars.
Questions people ask
How do I convert mpg to litres per 100 km?
Divide 282.5 by UK miles per gallon. A car doing 45 mpg uses about 6.3 l per 100 km. For US mpg, divide 235.2 instead.
How do I split fuel costs with passengers?
Enter the number of people including the driver and the calculator splits the fuel cost equally. Add tolls on top: Serbian motorway tolls are listed on the Putevi Srbije (Roads of Serbia) website.
Is LPG cheaper to run than petrol?
A car on LPG burns roughly 10 to 20% more litres than on petrol, but a litre of LPG costs far less. Enter the LPG consumption and price, then compare the cost with petrol.
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Updated: 13 November 2026