Question 1

What is CBM in freight shipping?

Accepted Answer

CBM stands for Cubic Meter, which is the standard unit of measurement for calculating the volume of a shipment. It is calculated by multiplying the Length × Width × Height of the cargo in meters. CBM is essential for determining shipping costs, especially for sea freight (LCL) and air freight where volumetric weight may exceed actual weight.

Question 2

How is volumetric weight calculated for air freight?

Accepted Answer

For air freight, volumetric (dimensional) weight is calculated as Length × Width × Height (in cm) ÷ 6,000. Airlines charge based on whichever is greater: actual gross weight or volumetric weight. This is known as "chargeable weight." For example, a box measuring 60×40×40 cm would have a volumetric weight of 16 kg.

Question 3

What is the difference between CBM and chargeable weight?

Accepted Answer

CBM measures volume in cubic meters, while chargeable weight is the weight used for billing. In sea freight, rates are typically per CBM. In air freight, the chargeable weight is the greater of actual weight or volumetric weight (dimensions ÷ 6,000). Understanding both helps you optimize shipping costs.

Question 4

How many CBM fit in a 20ft container?

Accepted Answer

A standard 20-foot container (TEU) has an internal volume of approximately 33 CBM, though the usable space is typically around 25-28 CBM depending on cargo stacking. A 40-foot container holds approximately 67 CBM (usable: 55-60 CBM). A 40ft High Cube container holds approximately 76 CBM.

Question 5

How can I reduce my shipping costs using CBM calculations?

Accepted Answer

Optimize packaging to minimize wasted space, stack cargo efficiently, consider consolidation (LCL) for smaller shipments, and choose the right container size. AirBuzz International helps clients optimize their cargo dimensions and select the most cost-effective shipping method based on CBM and weight calculations.

Question 6

What CBM calculation is used for sea freight vs air freight?

Accepted Answer

For sea freight (LCL), the rate is typically charged per CBM or per 1,000 kg, whichever is greater (1 CBM = 1,000 kg ratio). For air freight, volumetric weight uses a ratio of 1:6,000 (cm) or 1:166.67 (kg per CBM). This means air freight is more sensitive to volume, making compact packaging even more important for air shipments.

CBM Calculator for Air & Sea Freight

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Calculation Results

Understanding CBM & Chargeable Weight

Air Freight Formula

Sea Freight Formula

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