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Cubic Weight Formula:
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Cubic weight (also known as volumetric weight) is a pricing technique used by Australia Post and other carriers to account for the space a package occupies in relation to its actual weight. It ensures that lightweight but bulky items are priced appropriately.
The calculator uses the Australia Post cubic weight formula:
Where:
Explanation: The formula calculates the volumetric weight by dividing the cubic volume by 5000, which is the standard conversion factor used by Australia Post for domestic and international shipping.
Details: Australia Post charges based on whichever is greater - the actual weight or the cubic weight. This ensures fair pricing for both small heavy items and large lightweight items that take up significant space in transport vehicles.
Tips: Measure the outer dimensions of your package in centimeters. Enter length, width, and height. All values must be positive numbers. The result will be in kilograms.
Q1: Why does Australia Post use cubic weight?
A: Cubic weight pricing ensures that carriers are fairly compensated for the space occupied by lightweight but bulky packages in their vehicles.
Q2: How do I measure package dimensions correctly?
A: Measure the longest points of each side in centimeters. Include any bulges or protrusions in your measurements.
Q3: What if my package has irregular shape?
A: For irregular shapes, measure the dimensions of the smallest rectangular box that can contain the item.
Q4: Is the conversion factor always 5000?
A: Yes, Australia Post consistently uses 5000 as the conversion factor for both domestic and international shipments.
Q5: How is the final shipping cost determined?
A: Australia Post compares the actual weight and cubic weight, then charges based on whichever is greater.