How to calculate CBM
CBM (cubic metre) = length × width × height in metres. For a carton measured in centimetres:
CBM per carton = L × W × H ÷ 1,000,000
Example: a 60 × 40 × 40 cm carton is 0.096 CBM. 100 cartons are 9.6 CBM.
Container sizes
| Container | Inside (approx.) | Volume | Practical load |
|---|---|---|---|
| 20 ft standard | 5.9 × 2.35 × 2.39 m | about 33 CBM | 25 to 28 CBM |
| 40 ft standard | 12.0 × 2.35 × 2.39 m | about 67 CBM | 55 to 58 CBM |
| 40 ft high cube | 12.0 × 2.35 × 2.69 m | about 76 CBM | 65 to 68 CBM |
Practical loads are lower than full volume because cartons never fill every gap. Weight limits also apply and vary by carrier and by road rules in each country.
LCL or FCL?
- LCL (less than container load): you share a container and pay per CBM. Usually best below about 15 CBM.
- FCL (full container load): you book the whole container. It is often cheaper per CBM above about 15 CBM, with less handling and lower damage risk.
Get quotes for both when you are near the line.
Loading tips
- Choose carton sizes that stack well across the container width.
- Heavy cartons go at the bottom, with weight spread evenly.
- Pallets make handling easier but use about 10 to 15% of the space.
- Wooden pallets and crates must be ISPM 15 heat-treated and stamped.
- Mark every carton with the PO number, carton number and gross weight.
Plan your load with the CBM and container calculator.
Frequently asked questions
How many CBM fit in a 20 ft container?
A 20 ft container holds about 33 CBM, but a practical load of cartons is usually 25 to 28 CBM.
How do I calculate CBM from centimetres?
Multiply length × width × height in centimetres and divide by 1,000,000. Then multiply by the number of cartons.
