Maximum parcel size and weight*

Size guide
Destination Maximum weight Maximum length Maximum dimensions
Domestic

Maximum weight

22kg

Maximum length

105cm

Maximum dimensions

0.25 cubic metres

International

Maximum weight

20kg

Maximum length

105cm

Maximum dimensions

140cm girth

How we assess parcel charges

Domestic parcels

Domestic parcels over 1kg are charged according to their actual weight or cubic weight equivalent, whichever is greater. For parcels up to 1kg, cubic weight is only calculated if the parcel is large in size or irregular or cylindrical in shape.

International parcels

International parcels are charged according to actual weight.

Please note: You do not need to cube Australia Post prepaid or flat rate satchels. 

Maximum letter size and weight**

Size guide
Destination Size Maximum weight Maximum dimensions Maximum thickness
Domestic

Size

Small envelope

Maximum weight

250g^

Maximum dimensions

130 x 240mm

Maximum thickness

5mm^

Size

Large envelope

Maximum weight

500g

Maximum dimensions

260 x 360mm

Maximum thickness

20mm

International

Size

Envelope

Maximum weight

500g

Maximum dimensions

260 x 360mm

Maximum thickness

20mm

Does your item qualify as a letter?

To be considered a letter, your item must:

  • weigh less than 500g
  • contain flexible items only (if being sent within Australia)  
  • have a rectangular shape
  • be no larger than a B4 envelope (260mm x 360mm x 20mm)
  • be no thicker than 20mm

Is your item bigger than this? We would classify this as a small or large parcel.

  • * Some domestic parcel services have specific size and weight restrictions. Please check the service for more details before lodging your article.
  • While Australia Post accepts articles of the specified size and weight for International posting, some countries may have their own restriction on parcel sizes. Customers should confirm with the foreign postal agency if concerned.
  • ** Letters should not contain stiff objects such as bottle tops, pens, items enclosed in a hard case, and so on. High-speed letter sorting equipment could damage such objects, or the objects could damage other articles.
  • Different size & weight restrictions apply to seasonal greeting cards, valid for postage between 1 November and 31 December. View domestic letter prices for more information.
  • ^ Maximum weight and thickness differs for small Express Post envelopes. For more information, visit our Express Post letters page.