Group only packages with the same dimensions and weight. Calculate each group separately and add their CBM; do not multiply the largest carton by the total package count.
Measure the packaging that will actually travel
Record the outer length, width and height of the finished package. Include protection and any pallet or protruding parts. If different cartons are inside a pallet, avoid counting them again as separate volume on top of the final pallet volume.
iContainers explains calculating different package sizes by group. Geometric volume helps describe cargo; chargeable space and acceptance need a review with the operator.
Use consistent units in each calculation
For centimetres: group CBM = length × width × height × carton count ÷ 1,000,000. If all three dimensions are in metres, multiply directly by the carton count.
Check units before copying numbers. Keep precision during the calculation and display enough decimals to describe a small lot. Commercial rounding rules need separate confirmation.
Example: two sizes, five cartons
This is an arithmetic example, not a rate or a completed shipment.
Scroll the table sideways to see all columns.
| Group | Carton count and outer dimensions | Group CBM | Gross weight |
|---|---|---|---|
| A | 3 cartons at 60 × 40 × 35 cm | 0.252 m³ | 18 kg each; 54 kg total |
| B | 2 cartons at 50 × 30 × 40 cm | 0.120 m³ | 5 kg each; 10 kg total |
| Total | 5 cartons in two groups | 0.372 m³ | 64 kg |
Keep volume and weight separate
CBM measures volume; kilograms measure weight. Do not convert between them without identifying the rule being used. For air or parcel shipping, ask about the dimensional divisor, minimums, rounding and whether calculations apply per package.
DHL explains comparisons between actual and dimensional weight in its services. An aggregate reference does not replace your route’s charging method: the example packages have different densities and may need individual calculations.
Using the site calculator for several groups
The current calculator handles one group of identical packages. Enter group A, record the CBM and weight, then repeat for group B. Add the CBM and actual weights in your own list.
The calculator’s inquiry link describes the group currently shown. For the whole purchase, add both groups and the summary to the message; the link does not automatically contain both sizes.
Update the sheet when packaging changes
If a factory reduces cartons, adds protection or palletizes the goods, request new final dimensions and weight. Mark estimates as provisional and keep each version’s date.
For a quote, send the grouped list, packaging photos, product description, origin and destination. State any stacking or handling constraints so volume is not the only detail assessed.
Sources and scope
Sources consulted on 26 October 2026. Checklists and examples are planning guidance prepared by MX Pacific Express. Other operators’ processes illustrate concepts; the conditions for your cargo are confirmed separately.
Prepare your next step
Share the product, packaging, weight, origin and destination. Identify any information still pending so your inquiry can be reviewed with the right scope.
Discuss my measured cargoRoutes, availability and delivery conditions are confirmed in each quote.