10/09/2026
Understanding CBM and Volumetric Weight:
Essential Concepts in Shipping
Accurately calculating cargo volume and chargeable weight is an important part of shipment planning, cost estimation, and freight quotation.
Whether you work in logistics, freight forwarding, import, or export, understanding these two measurements can help you make better shipping decisions.
1 CBM - Cubic Meter
CBM (Cubic Meter) measures the volume of space occupied by your cargo.
Formula:
CBM = L Γ W Γ H
When dimensions are provided in centimeters.
Example:
L = 120 cm
W = 80 cm
H = 100 cm
120 x 80 x 100 1,000,000 = 0.96 CBM
2 Volumetric Weight
Volumetric Weight converts the space occupied by cargo into a weight equivalent. It is commonly used in air freight to calculate the chargeable weight of shipments.
Formula:
Volumetric Weight = L Γ W Γ H Γ· 6000
Example:
120 x 80 x 100 6000 = 160 KG
3 Which Weight Is Charged?
For air freight, the carrier generally compares:
Actual Weight vs. Volumetric Weight
The higher applicable weight is normally used as the chargeable weight.
Example:
Actual Weight: 120 KG
Volumetric Weight: 160 KG
Chargeable Weight: 160 KG
Key Takeaway
CBM tells you how much space your cargo occupies.
Volumetric Weight converts that space into a weight equivalent for freight calculation.
Understanding the difference between the two is essential for accurate quotations and avoiding unexpected shipping costs.
β² Important: Volumetric divisors may vary depending on the carrier, service, and shipment type. Always confirm the applicable divisor in the carrier's quotation or tariff.
Do you calculate CBM manually, or do you use an online calculator?
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