Chargeable Weight in Air Freight: How to Calculate Volumetric Weight and Packing Tips to Cut Costs

Understanding Chargeable Weight in Air Freight

In international air freight, the freight charge is not based only on the actual weight of a shipment but also on the space it occupies on the aircraft. Airlines always charge on the greater of the actual weight (gross weight) and the volumetric weight (also called dimensional weight). For bulky but light goods such as cotton, plastic products, foam components or garments packed in large cartons, the volumetric weight is usually higher than the actual weight and becomes the basis for the charge. Understanding how this works helps businesses budget their logistics costs proactively.

The Standard Formula for Volumetric Weight

To convert package dimensions into chargeable weight, airlines apply a standard volumetric factor to the length, width and height of each package. The most common formula used in air freight is:

Volumetric weight (kg) = (Length (cm) x Width (cm) x Height (cm)) / Conversion factor

The usual conversion factor in commercial international air freight is 6000 (or sometimes 5000, depending on the airline or express service). This means that every 6000 cubic centimeters of volume is equivalent to 1 kg of chargeable weight. If the calculated figure is higher than the weight shown on the electronic scale, the airline will charge on this converted figure.

Smart Packing Tips to Save Costs

To avoid paying high rates for empty space inside packages, importers and exporters can apply the following practical packing measures:

• Use the right carton size: Avoid cartons that are too large for the product inside. Measure the actual volume of the goods accurately and choose packaging that fits snugly.
• Make use of negative space: For products that can be nested or disassembled (such as furniture or assembly components), take them apart and arrange them neatly to minimize the height and base area of the package.
• Compression and vacuum sealing: For garments, bedding, pillows and other fabric products, vacuum bags significantly reduce volume before the items are packed into a rigid carton.
• Secure neatly without bulging: When applying stretch film or strapping, make sure the sides of the carton do not bulge, because airlines measure at the widest point of the package.

Practical Value and Solutions from Viet Power Logistics (VPL)

Optimizing chargeable weight not only saves businesses money directly on air freight but also improves the overall efficiency of the international supply chain. However, calculating and packing on your own can be difficult given strict airline standards or the specific rules for dangerous goods (DG). At VPL, our team of experts with extensive experience in air freight and dangerous goods transport is ready to support you, from checking packing specifications and measuring dimensions to advising on a suitable airline, until the shipment is delivered to its destination safely and at the lowest possible cost.

This article is for general information and was compiled by VPL from public sources at the time of publication. Regulations may change – please contact VPL for advice on your specific shipment.