SHIPMENT PLANNING GUIDE
CBM and chargeable weight: what buyers should measure
CBM describes cubic volume. It is not the same as gross weight or the weight used for pricing. Measure the outside of the final package, including its pallet or crate.
Calculate cubic metres
For dimensions in centimetres, CBM equals length × width × height ÷ 1,000,000. Multiply by the number of identical packages. For mixed sizes, calculate each group separately and add the results.
Worked example
An illustrative carton measuring 60 × 40 × 50 cm occupies 0.12 cubic metres. Ten identical cartons occupy 1.20 cubic metres before any additional pallet or crating allowance. If the cartons are later palletized, use the final palletized dimensions for the booking estimate.
Understand dimensional weight
Carriers may calculate a dimensional weight from package volume and compare it with actual weight under the applicable tariff. Divisors, minimums, rounding, and service rules vary. Confirm the method on the quotation instead of assuming a single divisor applies to all air or express shipments.
Volume does not establish loadability
Irregular shapes, non-stackable cargo, door clearances, weight distribution, and securing requirements affect usable space. A CBM total cannot tell you whether a machine fits a container or how many cartons can safely be stacked.
Measure before requesting rates
Record units, quantity, packed dimensions, gross weight, and stackability. Keep estimates clearly labelled until measured data is available. Our calculator estimates geometric volume only and does not produce a freight price.