Postal rates in Australia are straightforward once you know what you are actually paying for.
The base rate for a standard Domestic G Post letter is 85 cents as of the most recent price adjustment. That covers anything that fits inside a letter-sized envelope without exceeding the weight and dimension limits. Anything over that gets priced differently. Regular mail is processed through Australia Post's standard network, which means delivery usually lands within one to five business days depending on how far the letter has to travel. Express Post is a separate product at 99 cents and guarantees next-day delivery for metro areas, same-day for some regional postcodes if you drop it off before the morning cutoff. A single Forever stamp—the kind you buy at a post office counter or order online—currently covers the 85 cent domestic letter rate. You can also buy stamps in booklets of ten for $8.50 or in large quantities at a discount from authorized stamp retailers. The stamps themselves don't carry a denomination printed on them anymore; they are valued at whatever the current rate is at the time of issue. If the rate goes up, your existing stamps still work. That is the "Forever" part. It was introduced to stop people from hoarding stamps during rate increases, which used to be a thing. Here is where people get tripped up. A standard domestic stamp does not cover international mail. If you are mailing something to New Zealand, a G Post letter there costs 125 cents. To Japan or the UK it jumps to around 230 cents. Big Post flat rate envelopes are another pricing tier entirely—$2.95 for small and $4.95 for large within Australia, with similar but different rates for international destinations. If you just slap an 85 cent stamp on an envelope heading overseas, it comes back to you with a "postage due" notice. I learned this the hard way sending birthday cards to my sister in Perth when I was younger. The envelope wasn't heavy, but it was thicker than usual because I included photos. At the time the rate was 50 cents. I put one stamp on it. It came back three days later with a handwritten note saying I owed 35 cents. The clerk at the counter just looked at me and said "next time, use the scale." I have used the scale ever since.
The real edge case nobody warns you about is the overweight threshold. Australia Post's weight breaks happen at specific points. A letter under 50 grams gets the standard rate. Between 50 and 100 grams it costs double—so 170 cents, not a pro-rated amount. Between 100 and 250 grams you are into parcel pricing territory. The jump is immediate and substantial. I used to think you could just add a stamp or two incrementally. You cannot. The next bracket applies in full. This matters a lot if you are mailing something like a greeting card with multiple cards inside or a small book. People regularly mail items that weigh 62 grams and wonder why their stamp didn't cover it. It didn't. The pricing doesn't scale linearly inside the letter bracket. Another counter-intuitive detail: dimensional weight matters. Australia Post has a maximum length of 46 centimeters, a maximum length plus girth of 90 centimeters, and a maximum thickness of 25 millimeters for letters. Go over any of those and your item is reclassified as a parcel regardless of how light it is. I once mailed a flat art print that was only 80 grams but about 28 millimeters thick because of the frame. It got bounced back to parcel rates, which cost nearly three times as much. The workaround was to remove the frame, flatten the print, and use a rigid mailer that brought the thickness down to 20 millimeters. That kept it in letter pricing. If you need to send things regularly, buying stamps in bulk from Australia Post's website is cheaper than face value because of occasional discounts. Their online store often runs promotions where you get 5 to 10 percent off bulk purchases. The physical post office approach—walking in and buying individual stamps—is fine for one-offs but you pay full retail with no discount. For businesses or frequent senders, an Australia Post account with negotiated rates makes more sense. These accounts offer volume pricing that can drop domestic letter rates significantly below 85 cents per piece, though there is usually a minimum monthly spend requirement.
The main downside to the current system is that rate changes happen unpredictably. Australia Post has increased domestic letter rates roughly every two to three years, sometimes more frequently during inflationary periods. If you have a drawer full of old stamps, they are still valid, but your expectations about what a dollar gets you should be adjusted accordingly. Don't buy large quantities of stamps hoping they will hold their value. The savings from a bulk discount at purchase time are negligible compared to the inconvenience of managing expired stock or a sudden rate hike that leaves your old supply in limbo. For the most accurate pricing on a specific item, use the Australia Post postage calculator online. It asks for weight, dimensions, destination, and service type, then gives you the exact rate. It is faster than guessing and it prevents that awkward moment at the counter when your envelope gets weighed and you have to cover the shortfall. The calculator is available on australiapost.com.au and it reflects the latest rates in real time. No app needs to be downloaded. No membership required. Just enter the details and go.
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