Maximum parcel size and weight1

Size guide
Destination Maximum weight Maximum length2 Maximum dimensions
Domestic

Maximum weight

22kg

Maximum length2

105cm

Maximum dimensions

0.25 cubic metres

International

Maximum weight

20kg

Maximum length2

105cm

Maximum dimensions

140cm girth

How we assess postage for parcels sent within Australia

How we assess postage for parcels sent overseas

International parcels are charged according to actual weight. The maximum weight you can send is 20kg and the maximum girth is 140cm.

Note: You don't need to cube Australia Post international prepaid  satchels or flat rate satchels.

Maximum letter size and weight3

Size guide
Destination Size Maximum weight Maximum dimensions Maximum thickness
Sending within Australia

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

Sending overseas

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

Size

Greeting card

Maximum weight

50g

Maximum dimensions

260 x 360mm

Maximum thickness

5mm

Letter size guide

Read our letter size guide below to confirm if your item is a small or large letter, or a small or large parcel.

Small and large seasonal greeting cards must be enclosed in a sealed envelope and endorsed with 'card only'. Only available in November and December.4

Business price guides, postage costs and delivery times

Download our business price guides, or use our online calculator to estimate the postage cost and delivery time to ship your parcel or send a letter within Australia or overseas.

Reduced size and weight limits for domestic parcels for Contract customers

On 1 November 2023, we updated the new maximum limits that Australia Post can accept:

  • Weight: actual weight of up to 22kg
  • Length: longest side up to 105cm
  • Volume: cubic volume up to 0.25 cubic metres

We have invested substantially in automated sortation equipment across our network to meet the demands of increasing parcel volumes due to the continued growth in eCommerce. However, large parcels are not compatible with this equipment and cause capacity issues, create bottlenecks and require additional handling to be moved safely through our network and delivered to our customers.

Establishing clear limits helps us maintain the efficiency of our network and ensure safe operating conditions for our team and customers.

From 1 November 2023, an Over Maximum Limits Fee applies to parcels that exceed our maximum size and weight limits. Oversized parcels identified at lodgement points may be returned to sender and will incur an Administration Fee of $50.00 (GST inclusive), in addition to the Return to Sender charge specified in your contract. For any oversized parcels which do make it into our network for delivery, Australia Post may apply the Over Maximum Limits Fee of $100.00 (GST inclusive), in addition to the normal delivery charge for that parcel.

The previous Manual Handling Surcharge applied for oversized parcels no longer applies.

1 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. Please check with the foreign postal agency if concerned or view our International post guide.

2 For parcels where you use your own packaging or any other packaging, which is not eligible for the national flat rates for postage based on size, Australia Post will assess charges according to the actual weight or cubic weight equivalent of the parcel, whichever is greater. Learn more about cubing on page 5 of our Domestic parcels guide (PDF 443kB).

3 Small, inflexible items, such as keys, pens, USBs and CDs, shouldn’t be sent in regular paper envelopes as they can get damaged in our sorting machines.

Maximum weight and thickness differs for small Express Post envelopes. For more information, visit our Express Post letters page.

4 Different size and weight restrictions apply to seasonal greeting cards, valid for postage between 1 November and 31 December. View page 4 of our Post Charges Booklet (PDF 1.1MB) for more information.

5 To avoid small letters getting trapped in machinery or other letters, they should exceed 88mm x 138mm. Sealed envelope mail is preferred. However, if posted unsealed, the opening should not exceed 88mm.

6 View page 30 of our Post Charges Booklet (PDF 1.1MB) for more information.