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In the logistics industry, tonnage can be described, in its simplest definition, as the carrying capacity of cargo. The fact that the carrying capacity of each vehicle is different leads to the need for different tonnage calculations. At the same time, cargo capacity details that are not suitable for the vehicle can cause you to face monetary fines and create dangerous consequences.
These penalties can multiply financial damages by causing you to be in a difficult financial situation and causing damage to the vehicle. Therefore, tonnage is an important factor in terms of both safety and cost. Now, let's take a closer look at the definition of tonnage and how it should be calculated! ⏬
What is Tonnage?
Tonnage measures the amount of cargo a vehicle can carry in tons. If we look at the definition of tonnage for modern shipping, it can be described as the calculation of a ship's volume or cargo volume.
Tonnage is used to measure different cargo limits of vehicles of various sizes. While it is not used in a machinery vehicle like a tractor, it is used in large vehicles like trucks or trailers. ✅
How to Calculate Tonnage?
To calculate tonnage, some data is required. One of these details is the maximum weight in the driver's license/permit. Others are details regarding the dimensions of the vehicle.
Since all this data varies for each vehicle, the resulting tonnage measurement will also be different. You can find detailed information by browsing the different calculation types in the rest of our article. 👇
Gross Tonnage (GT) Calculation
Gross tonnage is the measure of the volume of the closed areas of the ship. The asymmetric shape of ships can make it difficult to determine the actual gross tonnage value. The estimated gross tonnage calculation is as follows: ⬇️
• K1 x V (K1 = 0.2 + 0.02LogV and V+ number of closed areas in cubic meters)
Net Tonnage (NT) Calculation
Net tonnage can be defined as the molded volume of the space where only the cargo will be loaded. The ratio of net tonnage to gross tonnage is generally expected to be 30% less. In addition, net tonnage should be 90% of gross tonnage for sailing boats and 80% of gross tonnage for motorboats. The calculation is as follows:
• K2 x Vc (4d/3D) ^2 + k3 x (N1+N2/10)
DWT (Deadweight Tonnage) Calculation
DWT tonnage, called deadweight, calculates the weight that the ship can carry safely. The higher the DWT tonnage, the more orders and customer requests are met positively.
In making this calculation, the entire contents of the ship are taken into consideration. The following items can be given as examples: 👇
• The volume of the ship
• Cargo on the ship
• Provisions
• Fuel
• Weight of passengers and crew
Tonnage Calculations in Various Transport Modes (Road, Air, Sea, Rail)
The transportation sector includes various transport modes: road, air, sea, and rail. Each mode uses different tonnage calculation methods to determine its capacity. 👈
In road transport, heavy vehicles such as trucks and trailers are generally used. Tonnage in this type of transport is based on the gross weight, which is the maximum payload weight that the transport vehicle can carry.
Air transport is weight-based, and the cargo capacity of aircraft relies on the total payload weight they can carry. The carrying capacity of planes is usually expressed in kilograms.
In maritime transport, the carrying capacity of vessels is based on the "deadweight" (DWT) measure expressed in tons. DWT represents the maximum weight of cargo, fuel, fresh water, crew, and passengers that a ship can carry.
In rail transport, the carrying capacity of wagons is expressed in kilograms or tons, and there is a specific maximum payload weight for each wagon.
Tonnage Calculation Examples
Tonnage is a calculation of great importance in the logistics industry and must be complied with. The tonnage calculation of each transport vehicle in this sector is different from each other. Some examples are given in the continuation of the article. 👇
Tonnage Calculation Examples in Container Shipping
If we take a 20' open top container as an example; ⬇️⏬
• Width: 2.35m
• Height: 2.35m
• Length: 5.89m
• Volume: 33m2
• Empty weight: 2400kg
• Cargo capacity: 21,600kg
Tonnage Calculation Examples in Truck Transport
In truck transport, calculation is made based on carrying capacity (tons) and volume capacity (cubic meters). A truck's tonnage capacity is determined by the gross weight specified in the truck's technical specifications.
For example, let's assume that a truck has a carrying capacity of 10 tons and a volume capacity of 40 cubic meters in its technical specifications. If the total weight of the goods you want to load is 8 tons and the volume is 45 cubic meters, even though the tonnage capacity is sufficient here, this truck cannot carry the goods because the volume capacity is insufficient.
If the total weight of the goods you want to load is 12 tons and the volume is 35 cubic meters, even though the volume capacity is sufficient here, this truck cannot carry the goods because the tonnage capacity is insufficient.
Therefore, when making tonnage calculations in truck transport, attention should be paid to both the total weight of the goods (tons) and the total volume (cubic meters). The carrying and volume capacity of the truck must meet the total weight and volume of the goods.
Tonnage Calculation Examples in Air Cargo Transport
Tonnage calculations in air cargo transport are usually based on the actual weight and volume of the products. The total weight a cargo plane can carry depends on the maximum takeoff weight of the plane, including fuel, crew, and cargo.
Let's consider an air cargo shipment as a calculation example. Suppose a package has an actual weight of 150 kilograms and a volume of 1 cubic meter (1m x 1m x 1m). However, calculations in air transport use the greater value between weight and volume. The volumetric weight formula generally used in air cargo transport is:
Volumetric Weight (kg) = Length (cm) x Width (cm) x Height (cm) / 6000
For example, in this case, if the dimensions of the package are 100cm x 100cm x 100cm, the volumetric weight would be 166.67 kg using the calculation formula (1,000,000 / 6000). In this case, since the actual weight of the package is 150 kg, the tonnage calculation in air cargo transport is made over the volumetric weight. Because the volumetric weight is greater than the actual weight.
Volumetric weight is particularly important in cargo transport because the carrying capacity of planes depends not only on weight but also on volume. A light but bulky load can occupy a significant amount of space in the aircraft cargo hold, which can prevent heavier but less bulky loads from being transported. Therefore, volumetric weight is taken into account in tonnage calculations in air transport.
Tonnage Calculation Examples in Ship Transport
For ship transport tonnage calculations, gross tonnage, net tonnage, DWT tonnage, displacement tonnage, and light ship weight tonnage are used. For example: ⏬
• For a boat with a simple sailboat hull: Gross Tonnage = (.5 x L x B x D) divided by 100.
• For a sailboat with a keel: Gross Tonnage = (.375 x L x B x D) divided by 100.
• For speedboats: Gross Tonnage = (.67 x L x B x D) divided by 100.
Tonnage Calculation Tools and Formulas
You can access tonnage calculation tools online. By entering some information about your vehicle into these tools, you can calculate the tonnage and get informed.
The formula generally used for tonnage calculation can be described as "3.75 of the maximum loaded weight of the vehicle + maximum loaded weight of the vehicle + 500 kg". At the same time, you can access the load amounts that appeal to your vehicle type online to get information about your vehicle's tonnage limit.
Frequently Asked Questions
What are the common mistakes made in tonnage calculations and how to prevent them?
The tonnage calculation process requires correctly understanding and using units of measurement, formulas, volume, and weight. Mixing different units or incorrect conversions can lead to misleading results. Similarly, using the wrong formula can cause incorrect results in tonnage calculations.
During these processes, it is important to know which formula to use according to the type of transport and cargo. Furthermore, making measurements accurately is crucial for the correctness of the result.
One of the most confusing issues in the tonnage calculation process is not understanding the difference between volume and weight. These two concepts have different properties and cannot be directly interchanged. To calculate the correct tonnage, it is necessary to understand the difference between volume and weight and to use these two concepts accurately. ✅
For a more accurate and effective tonnage calculation, seeking help from a logistics or transport expert when necessary can also be very beneficial. In this way, misleading results can be avoided, making the transport process more efficient. 😍🔛
What is the impact of carrying capacity on costs?
Determining the tonnage carrying capacity prevents many negative situations. In case the limits are exceeded, various penalties can be imposed. Carrying more cargo than a vehicle should carry can damage the mechanism of the vehicle and the environment. To prevent this situation, which directly affects your costs, you can make a tonnage calculation.
What factors should be considered in tonnage calculations?
The process of calculating tonnage plays a vital role in transport activities, and a number of factors need to be paid attention to. First and foremost, it is crucial to be aware of the type of cargo. This is because it determines which tonnage calculation formula should be used.
In addition, it is essential to accurately measure both the volume and the weight of the load. Volume and weight are the main components of tonnage calculation, and ensuring both measurements are correct guarantees an accurate result.
It is also necessary to consider what the mode of transport is. Tonnage calculations are different for road, sea, air, and rail transport. 👈
Conclusion
The developing logistics industry worldwide brings efficient results in many senses when carried out with the correct practices. To ensure safe and convenient transport, it is absolutely necessary to master tonnage calculation in logistics.
Thanks to the correctness of the calculated tonnages, targets are achieved without damaging the vehicles and the environment. It is predicted that an incorrectly calculated tonnage can cause great financial damage to companies.
In this process, having detailed information about tonnage in logistics is key to making significant progress in optimization. By having information about tonnage in logistics, you can implement the most correct transportation.
