To calculate fuel consumption per kilometer, use the formula: Fuel consumption = Fuel used / Distance travelled[1]. For example, if you consumed 10 liters of fuel over 100 kilometers, your consumption is 0.1 liters/km[3].
If you prefer to express fuel consumption per 100 kilometers, multiply the per-kilometer value by 100. For instance, using the previous example: 0.1 liters/km × 100 km = 10 liters/100 km[3].
To find fuel economy in kilometers per liter (km/l), use: Distance travelled / Fuel used. For example, a car that traveled 150 kilometers using 10 liters of fuel achieved 15 km/l[2][5].
A fuel consumption calculator online typically asks you to enter distance travelled and fuel used. It then instantly computes fuel consumption per kilometer and per 100 kilometers, or fuel economy in km/l, and can estimate trip cost by allowing you to enter the fuel price as well[1][3][4].
For calculating fuel cost per kilometer, divide the cost of fuel used for the trip by the total distance traveled. For example, using a total fuel cost of $25 over 200 kilometers, your cost per kilometer is $0.125/km[1][3][4].
Most calculators also support other units, such as miles per gallon (mpg), and liters per 100 kilometers (l/100km), with easy conversion between units[2].