Fuel Average Calculator
Check your car's real fuel average in km per litre, litres per 100 km and miles per gallon, and what each kilometre costs.
Fill the tank to the top, reset the trip meter, drive, then fill to the top again.
Fuel average
12 km per litre
- Litres per 100 km
- 8.3333
- Miles per gallon (UK)
- 33.8977
- Miles per gallon (US)
- 28.2258
- Fuel cost per km
- Rs 22.08
420 km on 35 litres is 12 km per litre (8.3 L/100 km), costing Rs 22.08 a kilometre.
How it's worked out
- Average
420 km ÷ 35 L12 km/l - Per 100 km
100 ÷ 128.33 L
The formulas
km per litre = distance ÷ litres · L/100 km = 100 ÷ km per litre · cost per km = fuel price ÷ km per litre
Worked example
420 km on 35 litres is 12 km per litre, or 8.33 L/100 km. At Rs 265 a litre, each kilometre costs Rs 22.08.
Questions people ask
How do I check my car's fuel average?
Fill the tank to the top and reset the trip meter. Drive normally, then fill to the top again. Divide the kilometres driven by the litres it took to refill.
What is a good fuel average?
For a 1,000 to 1,300 cc car, around 13 to 18 km per litre on the highway is common, and less in city traffic. Hybrids can do over 20.
How do I convert km per litre to L/100 km?
Divide 100 by the km per litre. 12 km/l is 8.33 L/100 km.
About this calculator
Formula and rules last checked 25 October 2026Written and tested by the CalculatorDex teamReport a problem