How to calculate the true cost of each shipment in a transport company

Start by defining what you are going to measure

The cost per shipment is not calculated simply by dividing the fuel bill by the kilometres on a route. To estimate it meaningfully, a transport SME must gather the expenses associated with its operations and decide how to allocate those shared by several vehicles, routes or services.

Before doing the sums, set an analysis period—a month, for example—and a unit of comparison: a shipment, a complete route, a delivery or a kilometre. Keep that unit consistent in subsequent reports. Also distinguish kilometres travelled from kilometres billed: if the vehicle travels empty for part of the journey, that distance still consumes resources even though it does not appear as billable distance.

There is no universal method for assigning every expense to each shipment. The result depends on the allocation rules chosen and the quality of the data. It is therefore advisable to document the criteria and apply them consistently, rather than present an estimate as if it were an exact figure or one that can be compared with any other company’s.

Gather the operation’s full costs

A useful calculation distinguishes three groups. This classification helps check that no item has been omitted, although a company may organize its accounts differently.

• Variable vehicle costs: fuel, tolls, tyres, maintenance and repairs. These are related to usage, although not all of them vary in exact proportion to each kilometre.
• Fixed costs: staff wages and contributions, insurance, taxes, vehicle rental or financing, and depreciation. These remain in place during the period even if the number of trips changes.
• Indirect costs: administration, planning, accountancy services, telephone and software. They usually cannot be linked directly to a single shipment, but they are part of the activity that makes it possible to provide the service.

Record amounts for the same period and use a consistent accounting method. If the truck is owned by the company, include an estimate of its depreciation; if it is used through a rental or leasing arrangement, record the corresponding cost without duplicating items. The driver’s time must also be reflected: if the owner drives, their work still has a cost even if it does not appear as payroll.

First calculate the cost per kilometre for the fleet or vehicle

As a starting point, add up the costs for the period and relate them to the kilometres actually travelled:

This indicator provides a basis for estimating routes, but it is reliable only if the numerator is complete and the denominator reflects actual activity. If wages, overheads or empty kilometres are excluded, the result may understate the cost.

For a more precise picture, also calculate the cost of each vehicle when the data allows. Allocate the costs that apply to it—such as insurance, depreciation and maintenance—across its kilometres, and keep general expenses in a separate category until you define an allocation method. Note which items are included in each cost-per-kilometre figure: an indicator calculated using full costs may include fixed items and indirect expenses as well as variable costs.

Allocate shared costs without hiding your assumptions

Expenses directly associated with a service, such as an identifiable toll, can be charged to that shipment. To allocate the rest, choose a basis that reflects how the resource is consumed. Some options are:

• Actual kilometres: useful for allocating costs linked to vehicle use. Include the empty kilometres attributable to the operation.
• Working or occupied hours: may be more representative when waiting, loading or unloading takes up significant time.
• Number of services or deliveries: may work for some administrative expenses, provided each operation involves a comparable workload.

You do not need to use a single basis for everything. For example, fuel can be allocated according to recorded consumption or kilometres travelled, while certain planning costs can be distributed per service. The important thing is not to change the method between customers or periods without recording the change: doing so may make comparisons inconsistent.

Account for empty running, waiting and incidents

A shipment can generate costs beyond the loaded journey. Consider the empty kilometres from the depot to the loading point, between deliveries or on the return journey when they are attributable to the service. If several shipments share the same journey, explain how you allocate that distance and avoid charging it in full to more than one shipment.

Also record waiting times, loading and unloading operations, detours and incidents. Waiting may not add kilometres, but it can occupy the driver’s and vehicle’s time. If you decide to include it in the shipment cost, establish how you value that time and apply the same method to the services being compared. Data on routes actually driven and times recorded in practice usually provide a more useful picture than a plan that does not reflect what happened.

From the cost per kilometre to the shipment cost

Once you have calculated unit costs and defined the allocations, you can estimate each operation by adding components that do not overlap. If you use a cost per kilometre that includes full costs, apply that rate to the attributable kilometres and do not add separately again any fixed costs, driver time or indirect costs already included. If, on the other hand, the cost per kilometre covers only variable vehicle costs, you can add time costs and the allocated share of fixed and indirect costs that it leaves out. Identified direct costs should be charged separately only if they are not already included in those rates or allocations.

The formula is a management framework, not a single accounting rule. In practice, the company must specify which items are included in each component and how they are allocated. If part of the activity shares a vehicle or route, record the shipment as part of that shared operation and allocate the shared costs using a verifiable basis, counting them only once.

It is advisable to keep the breakdown alongside the total: loaded and empty kilometres, hours, tolls, vehicle used and allocated expenses. This makes it possible to check why two services with similar distances have different costs, without mistaking an operational difference for a calculation error.

Compare services and review variances

With a consistent method, the estimated cost makes it possible to compare routes, customers and types of service. It does not by itself show that a service is profitable: to assess it against revenue, compare the cost with the corresponding billing and show any margin you calculate separately. Adding a margin percentage to the cost is a pricing decision, not part of the historical cost.

Review actual amounts and estimates periodically. Changes in fuel, maintenance, tolls, vehicle occupancy or waiting times can alter the result. It is also advisable to check that common costs have not been allocated twice and that the kilometres recorded match the available records.

The aim is not to obtain a standard rate that applies to the whole sector, but a transparent estimate for the company itself. In Spain, these guidelines serve as a management method: the resulting figure depends on the activity, the data and the allocation criteria, and does not in itself constitute an official rate or a tax or legal assessment.