Large C4 Prepaid envelope withdrawal

From 1 July 2025 Large C4 prepaid envelope will no longer be available to buy from postal outlets or online.

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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.

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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. 

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.

Learn about underpaid mail

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.

Postage costs and delivery times

Large volume business letters

If you send 300+ letters at a time within Australia, you may be eligible for lower prices.

Learn more

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).