Australia · Shipping
Australia Post cubic weight calculator.
Estimate the chargeable weight of an own-packaging parcel from its maximum length, width and height.
Formula: length × width × height in metres × 250 kg/m³. Australia Post generally uses the greater of actual or cubic weight for eligible parcels.
Parcel details
Estimate
Enter parcel details and calculate.
When cubic weight applies
Australia Post says cubic weight is used to account for the space a parcel occupies. For own packaging and other items outside national flat rates, charges are generally assessed on the greater of actual or cubed-weight equivalent. The carrier’s live postage calculator remains authoritative for a quote.
Source, last verified 29 September 2026: Australia Post — How to calculate cubic weight.
Estimate only
This calculator applies the published 250 kg/m³ formula. It does not price postage, determine packaging eligibility, or account for every Australia Post service rule.