Calculating Cubic Weight for the Australia Post Delivery Rate Calculator

Cubic weight is calculated by measuring and multiplying the length, height and width of the parcel. The result is then multiplied by the industry standard cubic weight conversion factor of 250.

eg. a parcel measuring 40cm long(0.4m) x 20cm high(0.2m) and x 30cm wide(0.3m)is equal to 0.024 cubic meter. Multiplied by the conversion factor of 250 gives, therefore, a cubic weight of 6kg.

0.4 x 0.2 x 0.3 = 0.024
0.024 x 250 = 6 kgs

If the actual weight is 4kg, postage would be assessed on the basis of 6kg.