Definition
CBM stands for Cubic Meter. It is the metric standard unit of volume, calculated by multiplying the length, width, and height of a shipment or container space (L x W x H). The calculation must use meters as the base unit to derive the correct CBM figure.
Function in Logistics
CBM serves two essential functions in logistics and supply chain management: space allocation and cost calculation. It is the foundational metric used when booking space on vessels (LCL), aircraft, and trucks, ensuring the physical size of the cargo is accurately accounted for.
Core Process: Calculating Chargeable Weight
Freight carriers often do not charge based solely on the actual gross weight of a shipment. They bill based on the greater of the Gross Weight or the Volumetric Weight (also known as dimensional weight). CBM is the metric used to calculate this Volumetric Weight.
This calculation uses a specific Dimensional Weight Factor (or CBM factor), which varies by mode of transport (air, ocean, road) and carrier. The formula is:
Volumetric Weight (kg) = Total CBM x Dimensional Weight Factor
If the volumetric weight derived from the CBM is higher than the actual weight of the shipment, the volumetric weight becomes the Chargeable Weight. This system ensures that bulky, lightweight cargo is charged appropriately for the space it consumes.
Expert Advice
Maximizing CBM utilization is critical for profitability, especially in Less-than-Container Load (LCL) and air freight shipments. Logicmile advises clients to audit packaging processes meticulously. Accurate measurement and proper pallet or container stuffing reduce 'dead air' space, directly lowering per-unit transportation costs and enhancing overall shipping efficiency.
Key Takeaways
• CBM is the volume measurement (Length x Width x Height in meters).
• It determines how much physical space your cargo occupies.
• CBM is directly used to calculate the Volumetric Weight.
• The chargeable weight for freight is always the greater value between the actual gross weight and the calculated volumetric weight.
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