Truck fuel cost per kilometer can be calculated directly from the truck’s real fuel consumption and the diesel price. The basic formula is: fuel cost per km = (L/100 km × price per litre) ÷ 100. For example, 30 L/100 km at €1.60/L equals €0.48 per km in fuel.
Use the free truck fuel cost calculator to calculate litres and trip fuel cost, then add the result to the truck cost per kilometre calculator when you need the full operating cost rather than fuel alone.
Fuel is one of the largest variable expenses in road transport. Even a small change in diesel price or fuel consumption can significantly affect the cost of a trip, especially when a truck covers thousands of kilometers every month.
Knowing your fuel cost per kilometer helps you estimate trip expenses, compare routes, prepare transport quotations and understand whether a load is profitable.
The calculation requires only three main values:
* fuel consumption in liters per 100 km
* diesel price per liter
* total distance travelled
How to Calculate Fuel Cost per Kilometer
Use this formula:
**Fuel cost per km = (Fuel consumption ÷ 100) × Diesel price**
Example:
* Fuel consumption: 30 L/100 km
* Diesel price: €1.60/L
Calculation:
**30 ÷ 100 × 1.60 = €0.48/km**
The truck therefore spends approximately **€0.48 in diesel for every kilometer travelled**.
For a 1,000 km journey, the estimated fuel cost would be:
**1,000 × €0.48 = €480**
Example: 1,000 km Truck Trip
Imagine a truck with the following values:
* Distance: 1,000 km
* Average fuel consumption: 32 L/100 km
* Diesel price: €1.65/L
First calculate how much fuel is required:
**1,000 × 32 ÷ 100 = 320 liters**
Then calculate the fuel cost:
**320 × €1.65 = €528**
The estimated fuel cost for the journey is **€528**.
Fuel cost per kilometer:
**€528 ÷ 1,000 = €0.528/km**
Rounded, this is approximately **€0.53/km**.
How to Calculate Fuel Required for a Trip
If you only need to know how many liters of diesel will be required, use:
**Fuel required = Distance × Fuel consumption ÷ 100**
Example:
* Distance: 750 km
* Consumption: 29 L/100 km
Calculation:
**750 × 29 ÷ 100 = 217.5 liters**
The truck will require approximately **217.5 liters of diesel**.
To calculate the total fuel cost, simply multiply the result by the diesel price.
Why Diesel Price Matters
Fuel prices can vary significantly between European countries and can change over time.
For international transport companies, the country where a truck refuels can therefore affect operating costs.
For example, imagine a transport company purchases 10,000 liters of diesel per month.
If the price difference between two refueling options is only €0.10 per liter:
**10,000 × €0.10 = €1,000**
That represents a difference of **€1,000 per month**.
Across several trucks and an entire year, small differences in diesel prices can become substantial.
Always Include Empty Kilometers
A common mistake is calculating fuel cost using only loaded kilometers.
However, trucks often travel empty before collecting cargo or after completing a delivery. Those kilometers still consume fuel and create operating costs.
Example:
* Loaded distance: 900 km
* Empty distance: 150 km
* Actual distance travelled: 1,050 km
Fuel costs should therefore be calculated using **1,050 km**, not only the 900 paid kilometers.
Ignoring empty mileage can make a transport job appear more profitable than it actually is.
Fuel Cost Is Not the Total Cost per Kilometer
Fuel is only one part of a truck's operating cost.
Other costs may include:
* driver wages
* road tolls
* truck leasing or financing
* insurance
* maintenance and repairs
* tyres
* AdBlue
* depreciation
* parking
* ferry costs
* taxes
* company overhead
For this reason, a fuel cost of €0.50/km does not mean that the truck's total operating cost is €0.50/km.
The real cost per kilometer can be considerably higher.
To price transport correctly, carriers should calculate both fuel expenses and the complete operating cost of the vehicle.
How Fuel Consumption Affects Annual Costs
Small differences in fuel consumption become much more important over large annual distances.
Consider two trucks travelling 120,000 km per year.
Truck A:
**28 L/100 km**
Truck B:
**32 L/100 km**
Difference:
**4 L/100 km**
Over 120,000 km:
**120,000 ÷ 100 × 4 = 4,800 liters**
At a diesel price of €1.60/L:
**4,800 × €1.60 = €7,680**
Truck B would spend approximately **€7,680 more per year on fuel**.
This is why monitoring real fuel consumption is important even for small fleets.
What Can Increase Truck Fuel Consumption?
Actual consumption can change depending on many factors, including:
* cargo weight
* vehicle configuration
* terrain
* weather
* traffic
* driving speed
* tyre pressure
* engine condition
* aerodynamic resistance
* driver behaviour
A fully loaded truck driving through mountainous terrain can consume considerably more fuel than the same vehicle travelling lightly loaded on flat roads.
For accurate cost calculations, use the truck's real average fuel consumption whenever possible.
How to Reduce Fuel Costs
Transport companies can reduce fuel expenses by monitoring several areas.
Correct tyre pressure helps reduce unnecessary rolling resistance.
Regular maintenance helps the engine and drivetrain operate efficiently.
Reducing excessive idling prevents diesel from being consumed while the vehicle is stationary.
Efficient route planning can reduce unnecessary kilometers, congestion and detours.
Driver behaviour also matters. Smooth acceleration, appropriate speed and anticipatory driving can reduce fuel consumption over long distances.
Companies operating several vehicles should also compare consumption between trucks. An unusual increase in fuel usage may indicate a maintenance issue or inefficient operation.
Quick Fuel Cost Formulas
For easy reference:
Fuel required
**Distance × Fuel consumption ÷ 100**
Total fuel cost
**Fuel required × Diesel price**
Fuel cost per kilometer
**Total fuel cost ÷ Distance**
Or directly:
**(Fuel consumption ÷ 100) × Diesel price**
Example:
* Consumption: 30 L/100 km
* Diesel price: €1.60/L
**30 ÷ 100 × 1.60 = €0.48/km**
Frequently Asked Questions
How much fuel does a truck use per 100 km?
Fuel consumption depends on the vehicle, cargo weight, road conditions, terrain, weather and driving style. For accurate calculations, use the actual average consumption recorded by the truck.
How do I calculate diesel cost for a trip?
Multiply the trip distance by fuel consumption, divide by 100, and then multiply by the diesel price.
**Distance × Consumption ÷ 100 × Diesel price**
Should empty kilometers be included?
Yes. Empty kilometers still consume fuel and should always be included when calculating the true cost of a trip.
Is fuel cost enough to calculate a transport price?
No. Fuel is only one expense. Transport pricing should also account for driver wages, tolls, maintenance, tyres, insurance, financing, depreciation, taxes and other operating costs.
Conclusion
Calculating truck fuel cost per kilometer is one of the simplest ways to understand transport expenses.
With distance, average fuel consumption and diesel price, you can quickly estimate how much fuel a journey requires, the total fuel cost and the fuel cost per kilometer.
For more accurate transport planning, fuel calculations should be combined with tolls, driver costs, vehicle expenses and empty mileage.
EuroTruckTools calculators can help carriers calculate these costs faster and compare different transport scenarios.
Calculate with your own data
Use the truck fuel cost calculator to calculate litres, total trip fuel cost and fuel cost per kilometer from your own figures.
Updated: 2026-08-31