Measure one packed carton, then count identical cartons
Start with the outside of the closed shipping carton. Include packaging, corner protection and any bulge. Product dimensions can understate the space actually handed to the forwarder. Record length, width and height in the same unit, and count only cartons that share all three measurements.
Our example uses ten cartons, each 60 × 40 × 30 cm. The calculator accepts centimeters directly; the underlying conversion to meters is 0.60 × 0.40 × 0.30. One carton occupies 0.072 cubic meters. Ten occupy 0.7200 m³.
Reproduce the arithmetic
The centimeter shortcut divides by 1,000,000 because each of three dimensions is divided by 100. Dividing the finished product by only 100 is a unit error, not a small rounding difference.
| Step | Calculation | Result |
|---|---|---|
| One carton in cm³ | 60 × 40 × 30 | 72,000 cm³ |
| Convert to m³ | 72,000 ÷ 1,000,000 | 0.072 m³ |
| Ten cartons | 0.072 × 10 | 0.7200 m³ |
Test the input that matters
After loading the example, change quantity from 10 to 11. The result should increase by one carton, from 0.7200 to 0.7920 m³. Change height from 30 to 32 cm while returning quantity to 10: the new total is 0.7680 m³. That extra packaging adds 0.0480 m³ across the shipment.
Changing the unit selector does not convert the entered numbers; it changes their interpretation. To enter the original example in meters, replace the measurements with 0.60, 0.40 and 0.30. Do not leave 60, 40 and 30 selected as meters.
Keep shipment volume separate from booked volume
For a shipment with different carton sizes, add one row per size. The mixed-carton worksheet below demonstrates why averaging dimensions fails. Retain the unrounded volume through the sum; the displayed total uses up to four decimal places.
Carton CBM does not include pallet boards, void space or protection around the finished load. If a forwarder rates the assembled pallet envelope, measure that envelope instead. CBM also does not determine whether the cartons fit through a container door or whether their weight exceeds payload.
Reproduce the calculation
Use the related Cargoivo calculator with your own shipment dimensions, weight, or quantity.
Open CBM Calculator →Cargoivo provides educational planning information, not a freight quote, engineering approval, customs advice, or carrier commitment. Verify current service rules, equipment specifications, and commercial terms before shipping.