CBM – cubic metres – is the language of shipping. Sea cargo, LCL consolidation, many cargo companies and even some movers price by volume. Knowing how to calculate CBM helps you compare quotes and book the right truck or container. This guide shows the method step by step, and how to use our free CBM calculator.
The basic formula
CBM = length × width × height (in metres)
Example: a carton 60 cm × 40 cm × 40 cm is 0.6 × 0.4 × 0.4 = 0.096 CBM. Fifty such cartons are 4.8 CBM.
If you measure in centimetres, divide the result by 1,000,000. In inches, multiply length × width × height and divide by 61,024.
Converting CBM to CFT
1 CBM is about 35.3 cubic feet (CFT). Many Pakistani transporters and movers talk in CFT, so it helps to know both. Our freight unit converter does this instantly.
How to measure correctly
- Measure the outside of the carton, including any bulges.
- For furniture, measure the widest, deepest and tallest points.
- For pallets, measure the whole stack including the pallet itself.
- Round up slightly – real loads never fit perfectly.
From CBM to vehicle size
Once you have the total, compare it with the space in the vehicle and leave 10–15% extra for packing gaps. As a guide:
- Small loads of a few CBM fit a pickup or loader.
- A typical home of 15–25 CBM needs a 16–20 ft Mazda truck.
- A 20 ft container has about 33 CBM of internal space; a 40 ft about 67 CBM; a 40 ft high cube about 76 CBM.
The CBM calculator adds weight too and shows the smallest vehicle or container that can take both.
Volumetric weight for air and courier
Air cargo and couriers often charge by “volumetric weight” when a parcel is large but light. They convert volume to a weight using their own factor and charge whichever is higher – actual or volumetric weight. Ask your courier which factor they use.
Frequently asked questions
Why is my quote in CBM if my goods are heavy?
For sea cargo, freight is often charged per CBM or per ton, whichever is higher. Heavy goods may be charged by weight.
Does packing material add CBM?
Yes – bubble wrap and crates make items bigger. Measure after packing.
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