Usually, sea freight is less costly than air freight. For smaller shipments, however, air freight can come out as cheaper. For a thorough comparison, a total cost analysis can be made where all costs involved for each alternative are calculated and compared. There are different measurements for calculating the cost for each transport mode – air, sea and road. As space is limited in an aircraft, goods will be priced according to a specific formula for air transport. For road and sea respectively, the formula looks different.