Volumetric Weight and Dimensional Weight (Desi) Guide in International Shipping

In international shipping, volumetric weight (or dimensional weight) is the weight value of a package calculated based on its dimensions instead of its actual weight. And shipping companies base their billing on whichever of these two values is higher. Desi is the unit used in Turkey to express this volumetric weight, and it is derived by formula from width, length, and height measurements. This guide explains how to calculate volumetric weight and desi and how to reduce your shipping costs.

Highlights of this guide:

• The difference between volumetric weight and actual (gross) weight, and which one shipping companies bill

• Desi calculation formula and an example calculation

• How the desi value changes the price in international shipping

• Methods to reduce desi costs by optimizing packaging

• Considering volumetric weight when receiving quotes via Navlungo

Table of Contents

1. What is volumetric weight and what is its difference from desi

2. How to apply the desi calculation formula

3. Why shipping companies base their billing on volumetric weight

4. How desi affects costs in international shipping

5. Reducing desi costs with packaging strategies

6. Calculating volumetric weight and comparing quotes with Navlungo

7. Commonly made calculation errors and solutions

8. Frequently asked questions

What is volumetric weight and what is its difference from desi

Volumetric weight is a value expressed in kilograms, calculated based on the space a cargo occupies. When weighing a shipment, shipping companies look at two figures: the package's gross weight (actual weight) on the scale and its volumetric weight calculated from its dimensions. The invoice is always issued based on the larger of these two.

Although the word "desi" seems synonymous with volumetric weight in daily usage, it is actually a unit of measurement, just like kilogram. Desi, which is widely used in road transport in Turkey, expresses the volume of the cargo in cubic centimeters and is converted into kilograms by dividing it by a specific coefficient. The same logic applies to international shipments, but the divisor coefficient may vary depending on the mode of transport and the service used.

For example, consider a parcel measuring 40x30x30 cm and weighing 3 kilograms. Even if its actual weight is low, if the volume of the box is large, the invoice is billed according to the calculated volumetric weight, not the actual weight. That is why e-commerce sellers need to consider not only the weight but also the box size when packaging products.

How to apply the desi calculation formula

Desi calculation is made by multiplying the width, length, and height measurements of the package in centimeters and dividing it by a specific constant number. The common formula in road transport is: (width x length x height) / 3000. In air cargo and many international couriers, the divisor is usually 5000, because aircraft cargo capacity is calculated differently than road transport.

Let's show it with an example: For a box measuring 50 cm x 40 cm x 30 cm, the volume is 60,000 cm³. When you divide this value by 5000, the volumetric weight is 12 kilograms. Even if the actual weight of the package is 8 kilograms, the invoice is billed based on 12 kilograms because the volumetric weight is higher.

There are a few points to consider when making calculations:

• Measurements must always be taken from the widest point of the package, basing on the outer packaging rather than the inner box

• Centimeter and inch units should not be mixed, and conversions must be made especially for shipments to countries using inches, such as the USA and the UK

• If multiple boxes are being sent, each box must be calculated separately and summed up

Applying this formula beforehand allows you to see the estimated cost before shipment and prevents surprise invoice differences.

Why shipping companies base their billing on volumetric weight

Shipping companies base their billing on volumetric weight because the carrying capacity of an aircraft, ship, or truck is limited not only by weight but also by the space it occupies. A light but bulky package can occupy the same loading space as a heavy but small package; in this case, the actual cost for the carrier is the space occupied rather than the weight.

That is why volumetric weight calculation is especially decisive in air cargo. Leaving too much empty space inside a box means the carrier company cannot allocate that space to another shipment. In summary, the invoice is issued based on the potential space the cargo occupies, not the actual weight carried.

For e-commerce sellers, the practical result of this is: putting a small and light product into a large box unnecessarily increases the shipping fee. Selecting packaging suitable for the product size means more efficient load planning for both the carrier and the sender.

How desi affects costs in international shipping

The desi value is one of the most decisive cost items of international shipping because the invoice amount is directly shaped according to the calculated volumetric weight. When the box size chosen for the same product changes, the amount to be paid can also change; in some cases, even if the actual weight remains the same, the price can double just because of the packaging.

The service type also affects this equation. On routes like Shipping to Germany or Shipping to US, eco and express options can use different carriers and different divisor coefficients. Therefore, different desi results may arise for the same package in different services.

The practical effect for sellers is as follows:

• For high-desi but lightweight products (e.g., textiles, toys), the volumetric weight is usually higher than the actual weight

• For dense and small products (e.g., electronic accessories, jewelry), the actual weight is usually decisive

• Calculating both values before shipping allows you to see which service is more suitable

Sellers selling through Etsy International Shipping or Amazon International Shipping can set pricing by knowing the desi value of each item in their product catalogs beforehand.

Reducing desi costs with packaging strategies

The most direct way to reduce desi costs is to choose packaging that matches the size of the product. Leaving unnecessary space inside the box increases both the cost of filling materials and the volumetric weight.

Here are a few methods that can be applied:

• Choosing a box or envelope that tightly wraps the product and is not larger than standard

• Using vacuum packaging for foldable or compressible products (clothes, soft toys)

• Combining multiple small products in a single box instead of shipping them separately

• Avoiding excessive filling materials for non-fragile products

Especially for sellers shipping a large number of orders, these small changes make a difference in total shipping expenses. Even reducing a product's box size by 5 centimeters can significantly lower the calculated desi due to the volume formula. Establishing packaging standards and applying them to all shipments is the most practical way to build a predictable cost structure in the long run.

Calculating volumetric weight and comparing quotes with Navlungo

Navlungo is a logistics platform that allows e-commerce sellers to manage their international shipments from a single panel, combining the process from store integration to delivery on a single screen. The platform offers comparative quotes from different logistics companies for shipping to more than 130 countries.

The process consists of the following steps:

1. You integrate your store in the global marketplace into the panel, and the shipping quote arrives automatically when an order is placed

2. By entering the dimensions and weight information of the package, you compare quotes among eco, express, and other service options

3. You select the quote with the appropriate price and duration, upload your documents, and make the payment online

4. Your shipment is picked up from your door and tracked via the panel

Entering the volumetric weight information beforehand allows you to see which quote is actually cheaper. Because a unit price that looks low in some services can end up being more expensive in total due to a high desi coefficient. Sellers shipping to the US can also see the customs cost in advance with the Calculate US Customs Duty tool. To get a quote, an application can be made via the Get Quote Now page.

Commonly made calculation errors and solutions

The most common error is entering measurements in the wrong unit. When shipping to countries that use inches, such as the US or the UK, entering centimeter values thinking they are inches makes the calculated desi appear much lower than its actual value. And this leads to invoice discrepancies later on.

Another error is basing calculations on the size of the product inside rather than the external size of the box. The carrier company always weighs and measures the outer packaging, so the calculation must also be made using external measurements. In addition, some sellers calculate multiple boxes as a single shipment and enter a single box measurement; however, each box must be evaluated separately and a separate desi calculation must be made.

Finally, forgetting that the divisor coefficient changes according to the service type is a common mistake. Since different coefficients like 3000 for road transport and 5000 for air transport are used, the correct formula must be applied according to the selected shipping method. In express services like DHL International Shipping, this coefficient may differ from standard road shipments.

Frequently asked questions

Are desi and volumetric weight the same thing?

No, desi is a unit of measurement, whereas volumetric weight is the result calculated with this unit. The desi value is calculated from the package's width, length, and height measurements, and this result is converted into kilograms and reflected on the invoice as volumetric weight.

What happens if the volumetric weight is lower than the actual weight?

In this case, the shipping company bases its billing on the actual (gross) weight, because the invoice is always issued based on the higher of the two values. For small but dense products, this usually means the actual weight is the decisive factor.

Which divisor coefficient is used in international shipping?

A coefficient of 3000 is widely used in road transport, and 5000 is used in air transport and many international couriers. Which coefficient applies varies according to the selected service and carrier company, so the service type must be checked when receiving a quote.

Does reducing the package size really lower the price?

Yes, mathematically, as the product of width, length, and height decreases, the calculated volumetric weight also drops. Even a reduction of a few centimeters can noticeably decrease the invoice amount, especially for high-volume shipments.

Does sending multiple products in a single box reduce the desi?

Consolidation generally yields a lower total desi compared to the total volume of small boxes shipped individually, because space waste is reduced. However, if the box becomes too large, this advantage may disappear, so choosing a box suitable for the number of products is important.

Can I calculate the desi on Navlungo before getting a quote?

Yes, by entering the package dimensions and weight information, you can see the volumetric weight on the quote comparison screen and compare the prices of different services accordingly. This helps you determine which service is more cost-effective before shipping.

Calculating desi and volumetric weight before shipping is the most practical way to estimate your international shipping costs. By entering your package dimensions and weight, you can get instant quotes for over 130 countries on Navlungo and compare services.