gold bar 400 oz Price in Australia Today — August 31, 2026

The price you see for this 400 oz (Good Delivery) gold bar is built from two parts. The first is the international spot price of gold, quoted per troy ounce in US dollars and updated continuously while global markets are open. We convert that quote into the weight of this product and into your local currency using live exchange rates, so the figure on this page always reflects the market as it stands right now rather than a stale daily fixing.

The second part is the premium: the margin a refinery, mint or dealer adds to cover refining, minting, insured transport, assay certification and their own profit. Premiums are expressed as a percentage of the metal value, and they are not the same for every size. Smaller units carry a proportionally higher premium because the fabrication cost per gram is fixed, while large investment units spread that cost across far more metal.

Because the metal value moves with the market and the premium moves with supply, dealer stock levels and demand for that specific size, two shops can quote different totals on the same morning. Treating this page as your reference for the metal value, and then comparing only the premium each dealer charges, is the fastest way to see who is genuinely competitive in Australia.

This product weighs 400 oz (Good Delivery). Investment-grade gold of this type is normally refined to 999 or 999.9 fineness, meaning 99.9% to 99.99% pure metal, and the fineness is stamped on the item itself alongside the refiner's name and, on modern products, a unique serial number. That stamp, together with the assay card the bar ships in, is what makes it easy to resell anywhere in the world without a fresh test.

Purity matters more than most first-time buyers expect. Jewellery is alloyed for hardness and typically trades at 18, 21 or 22 karat, which means you pay for craftsmanship you cannot recover on resale. A bullion bar is priced almost purely on metal content, so the gap between what you pay and what you can sell for is far narrower — the single biggest reason long-term buyers prefer bullion over ornaments.

Small sizes are about flexibility. They let you build a position gradually, gift a single unit, or sell only part of your holding when you need cash, and they are easy to store in a home safe or a small bank box. The trade-off is the higher percentage premium you pay at purchase and, sometimes, a slightly wider spread when you sell back.

Larger sizes are about efficiency. The premium per gram drops sharply as you move up the range, so if you are deploying a fixed budget in one transaction you keep more metal for the same money. The trade-off is that you can only liquidate the whole unit at once. Many buyers solve this by mixing sizes: a large unit as the core holding, plus a few small ones for flexibility.

Buy from a dealer who publishes both a buy and a sell price, states the premium openly, and issues an invoice with the weight, fineness and serial number written on it. Keep the original packaging and the assay card sealed; a tampered or missing card is the most common reason a buyer is offered less than the market rate. Avoid private cash deals for anything you cannot verify, and be sceptical of any price meaningfully below the metal value shown here.

When you come to sell, the same logic runs in reverse: the dealer buys at a small discount to spot to cover their own risk and handling. Widely recognised refiners and mints attract the tightest buy-back spreads because the buyer does not need to re-assay them. Comparing two or three quotes on the same day, and selling into a rising rather than a falling session, routinely recovers more than shopping around on the premium at purchase ever did.

The rate here refreshes with the spot market, so you can check it in the morning before visiting a dealer and again before you commit. The country table lets you compare the same bar across markets, since local taxes, import duty and currency strength can make the identical product noticeably cheaper or dearer from one country to the next. If your currency has weakened against the dollar, the local price of gold can rise even on a day when the dollar price is flat — a distinction worth understanding before you conclude the market has moved.