Large C4 Prepaid envelope withdrawal
From 1 July 2025, Large C4 prepaid envelopes will no longer be available to purchase online but can be purchased in-store, while stocks last.
Letter deliveries have changed
From 15 April 2024, estimated delivery timeframes for regular and priority letters have changed. Please note, letters may be delivered earlier than the timeframes shown on our website as we make progressive delivery model changes across the country through to the end of 2025.
Postage costs and delivery times for Regular letters
Postage costs for letters are determined by size, thickness and weight. Delivery times vary depending on the delivery speed you choose for your letter, and where it's sent from and where it's headed.
Check our letter size and weight guide to confirm if your item can be sent as a small letter/postcard, large letter, or seasonal greeting card including a Christmas card.
These prices are for sending within Australia. For concession rates, check concession stamp prices.
| Letter size and weight | Maximum size | Price | Number of $1.70 stamps |
|---|---|---|---|
| Small letter or postcard Up to 250g | 130 x 240 x 5mm Includes DL and DLX envelopes | $1.70 | 1 |
| Large letter Up to 125g | 260 x 360 x 20mm Includes C5 and B4 envelopes | $3.40 | 2 |
| Large letter Up to 250g | 260 x 360 x 20mm Includes C5 and B4 envelopes | $5.10 | 3 |
| Large letter Up to 500g | 260 x 360 x 20mm Includes C5 and B4 envelopes | $8.50 | 5 |
These prices include the envelope and postage for sending within Australia. For concession rates, check concession stamp prices.
| Envelope and weight | Size | Price for single item (includes GST) | Bulk price for pack of 10 (includes GST) |
|---|---|---|---|
| Prepaid envelopes | 160 x 118mm | $3.10 | N/A |
| Small DL envelope Up to 250g | 110 x 220 x 5mm | $2.00 | $19.50 (1-4 packs) $19.00 (5+ packs) |
| Small DL window-face envelope Up to 250g | 110 x 220 x 5mm | $2.00 | Pack of 50 - $97.50 Box of 500 - $950.00 |
| Medium C5 envelope Up to 500g | 162 x 229 x 20mm | $4.30 | $41.95 (1-4 packs) $40.85 (5+ packs) |
| Large B4 envelope Up to 500g | 250 x 353 x 20mm | $8.80 | $85.80 (1-4 packs) $83.60 (5+ packs) |
Buy prepaid envelopes and postcards
Calculate the cost and time to send your item
Use our online calculator to estimate the postage price and delivery time to send your letter within Australia. Choose ‘Australia’ and enter the ‘from and to’ postcode, then choose ‘Letters’. If you need more assistance, visit your local Post office and talk to our friendly team.
Underpaid mail
When using red street posting boxes, you must apply the correct postage for your items. If we detect that your mail was posted with insufficient postage, we may invoice you the difference plus an admin fee.
Concession card holders
If you have a concession card, you may be eligible for reduced rates on stamps for sending within Australia.
Frequently asked questions
Expected delivery times for letters vary depending on where it's sent from, where it's headed and the service used.
For more information, calculate postage & delivery times.
Where Australia Post has detected that your mail was lodged with insufficient postage, we may invoice you the difference plus an admin fee. Please click here for more information
The cost to send a regular letter, greeting card or postcard within Australia is $1.70 (including GST). Concession card holders may be eligible for concession stamps which are $0.60 each.
A special postage rate of $0.65 applies for small Christmas cards and $1.30 for large Christmas cards, sent during November and December. Your card must be in a sealed envelope and endorsed with ‘Card only’.
Use our online calculator to check other postage costs and delivery times. Choose ‘Within Australia’, enter the From and To locations, then click ‘Letters’ to view your options.
The postage cost to send a letter or greeting card overseas depends on the destination you’re sending to, the size of your envelope (small or large) and the service (Courier, Express or Economy Air). Use our online calculator for costs and delivery times. Choose ‘Overseas’, enter the From and To locations, then click ‘Letters’ to view your options.
The postage cost to send a greeting card (including a Christmas card), or your own postcard to one of 220+ overseas destinations is $3. This is via our Economy Air service, which takes 15+ business days. Your card must be in a sealed envelope and endorsed with ‘Card only’ (excludes postcards). It must be:
- no larger than 260mm x 360mm
- no thicker than 5mm
- no heavier than 50g.
The cost to send an international prepaid postcard to one of 220+ overseas destinations is $3.10. You can buy international prepaid postcards at the Post Office or through our Online Shop. This cost includes the postcard and the postage.
1 While we will endeavour to meet this timetable, the actual delivery speed will depend on where in each state/territory the item is being posted from/to, and the level of restrictions and congestion in our delivery network at the relevant time.
For detailed information on available service options and charges please refer to our Post charges guide (PDF 813kB).