How to calculate cubic metres (CBM) for sea freight
CBM is the unit behind most sea freight prices. Calculating it correctly avoids surprises.
The formula
CBM = length × width × height in metres. A 60 × 40 × 50 cm carton is 0.6 × 0.4 × 0.5 = 0.12 CBM; 50 such cartons make 6 CBM.
Common mistakes
- Using product dimensions instead of outer carton dimensions.
- Forgetting to convert centimetres to metres.
- Trusting supplier figures without measuring; we measure cartons on receipt in Yiwu.
Weight versus volume
LCL is usually charged per CBM or per tonne, whichever is greater (W/M). Very heavy goods may be charged by weight.
FAQ
Is sea freight charged by volume or weight?
LCL is usually charged per CBM, with weight considered for very heavy goods. FCL is charged per container.
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