Calculate CBM without mixing cargo and shipping volume
CBM means cubic metres. The multiplication is straightforward, but choosing the correct dimensions matters: the sum of carton volumes and the outside envelope of a pallet answer different questions. Record the basis beside every result.
Key takeaway
A 40 × 30 × 25 cm carton is 0.03 m³; 40 cartons are 1.2 m³. The illustrated loaded pallet has an outer volume of 1.33824 m³.
Convert the dimensions before multiplying
For dimensions in metres, volume equals length × width × height. For centimetres, divide the product by 1,000,000; for millimetres, divide by 1,000,000,000. A carton of 40 × 30 × 25 cm therefore occupies 30,000 cm³, or 0.03 m³. Use external carton dimensions when calculating its shipping volume.
Multiply by the correct quantity
Forty identical cartons give 40 × 0.03 = 1.2 m³. For different carton sizes, calculate each row separately and add the row totals. Keep quantity and unit visible, particularly when importing supplier lists. A row with dimensions in millimetres must not be interpreted as centimetres. Retain sufficient precision and round the final reporting value only as required.
Measure the loaded pallet envelope
The example pallet measures 120 × 80 cm and carries five layers of 25 cm on a 14.4 cm pallet. Its overall height is 139.4 cm. The outer envelope is therefore 1.2 × 0.8 × 1.394 = 1.33824 m³. This includes the pallet height and empty space inside that rectangular envelope; it is not the sum of material volumes.
Keep volume separate from fit and charges
Equal cubic metres do not guarantee equal packing. Long units, restricted orientations, support requirements or a narrow doorway can prevent a load from fitting. CBM also differs from volumetric weight and chargeable weight. Those depend on the transport mode and the carrier’s agreed conversion and billing rules. Do not derive a freight price from volume alone.
Pass on a result with a clear basis
When requesting a quote, state whether the figure describes loose cartons or the final palletized shipment. Provide the number of loading units, their external dimensions and gross weights alongside the volume. Include wrapping or overhang where it changes the envelope. Transfer the same dimensions into the loading planner so the volume calculation and the physical arrangement describe the same shipment.
Calculate with your own data
Convert carton dimensions into cubic metres, multiply quantities correctly and distinguish carton volume from the outer envelope of a loaded pallet.
Calculate shipment volume