Does Auspost charge by weight or size?

Decoding AusPost Pricing: Weight vs. Size for Parcels Under 5kg

Sending a parcel within Australia? Understanding Australia Post's pricing structure is crucial to avoid unexpected costs. While the headline often focuses on weight, the reality for parcels under 5kg is more nuanced, incorporating both weight and size. This article clarifies the complexities.

For parcels weighing up to 5kg, Australia Post employs a dual-pricing system depending on your packaging choice. This means that the cost isn't simply a straightforward weight-based calculation.

Scenario 1: Using Eligible Australia Post Packaging

If you utilize packaging provided or approved by Australia Post (satchels, boxes, etc.), pricing is categorized by size. Your parcel will fall into one of four size brackets, each with a corresponding price. This system simplifies the process, as the size automatically determines the cost, irrespective of the precise weight (as long as it remains under 5kg). Finding the correct size category for your package on the Australia Post website is essential.

Scenario 2: Using Your Own Packaging

Using your own packaging introduces a different calculation. Here, Australia Post considers both weight and cubic weight. While the actual weight of your parcel is a factor, Australia Post also calculates the cubic weight (length x width x height in centimetres, divided by 5000). The higher of the actual weight and the calculated cubic weight determines the postage cost. This means a lightweight but bulky item could cost more than a heavier, more compact package. Your parcel will then fall into one of four weight categories based on this determining weight.

In Summary:

The short answer to the question "Does AusPost charge by weight or size?" is: it depends. If using official Australia Post packaging, size determines the price. If using your own packaging, the price is determined by the greater of the actual weight or the calculated cubic weight. Always check the Australia Post website for the most up-to-date pricing and packaging guidelines to ensure you're selecting the most cost-effective option for your parcel. Failing to consider both weight and dimensions when using your own packaging could lead to significantly higher postage fees than anticipated. Understanding this dual system is key to accurate postage cost estimation and efficient parcel sending.